Malicious PDF — malware analysis report

Static analysis result for SHA-256 128d9e24275b17c9…

MALICIOUS

PDF

87.6 KB Created: 2021-06-29 04:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abce25c9d5b157053428403f80ba012a SHA-1: 5b0820b0342836021cfafbffd9df5afaa4b7c44a SHA-256: 128d9e24275b17c9e3d54de191697de337eaf2c11fcfd276c21900aa9ca57c1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous links to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the document's structure and embedded links likely facilitate the download of a secondary malicious payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/djdr8eqg2hdrgei1eapefuflcg/10071750637.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0a0d2686---tomeveduvevanetakinarixo.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/goduw.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8ebb7ffe---60594316782.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e6eea5e138f9c56f6cf5aeb664ab112b/dunitojowoz.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/3781adefc2bdb8249b793f7584e0f663/5473144741.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e84dd640---68203327828.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3398334b6---ledoxevujatopalepadebodav.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9fb0a627f8ceb5079f0cca2c7ad7aae0/nexodetinekifugigaw.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/17d3dd559d1a0f38f6783649b50d32fc/ratadusila.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/kinen4k3hf3ng114ckdhq2r313/wawazomowixim.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ed8ao6drd557io9kopqk3mh5i3/71734256988.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/37b5d9d348f2d2695ef189e77e9d127a/61987710365.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xipomiretulinufudefeloke.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2812a4c533---86492746074.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/zibiwafamiwakelamepus.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/56393897858.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/620e04dadd840c94b0c06a1efcc643a3/16213243134.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/49524044731.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/84k85npcuppmn0dvcpuccpo95g/xabikasuwuvijegaj.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/zogevozakaketiruxa.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6d9ee38d975f75808972cf895605662/ladidadefajo.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d3106eafcab---17515067136.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vsu3sp04a7hd8kh2u5rte351lq/wulagotedukofivunojugol.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/nf9kn17l9rmd6pi0c6a1f4t4oc/26978906084.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c041af2fd00227051092c15dcf267fbf/59581179412.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/32074320197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=uncollectible+accounts+expensePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 10616 bytes
SHA-256: d445ef7803a55565049f1d08dc264e07603e8e1d0fdcfb06f2e6ab40a5dcdbb9
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 17580 bytes
SHA-256: a40c22d3f5106457931f326c6d04b9c969cac60ec05487944062f81720999d56
font_02_sfnt_off0001371a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1