Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f81cee54f3ace4…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 02:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a111da8c6f16fa8997a9772ba76dfd7a SHA-1: 10674b5fe5512dda75f7ac9d96e607eb728aefa1 SHA-256: c1f81cee54f3ace459a4abf032cd3286cf11c8054daa0e00b42ffe9afac88f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. The document body is unreadable, but the heuristics and URLs point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f0746ea5d9c234df6a7843352dc1648d/vikakamo.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/nosug.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/juvupukotufifurujeme.pdfIn PDF document text
    • http://veribase.com/E/file/63069857355.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/gasodosozogutupuso.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad30814b78---84673080886.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b8a4f4b4feda96892d2a08edad8d27c9/8141184355.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/aa7a50605a04cf35526212e0d3829e5f/jibemox.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210529_104238.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/83967405626.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd4ae1a45---94002379377.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1441f619419e785cad79bf4700be4acd/13881657169.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/46928818461.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/63298678545.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/geganugunufo.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/72371675761.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210701035505.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a775158324---73941552689.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/46768161002.pdfIn PDF document text
    • https://congchungnguyenlieu.com/uploads/files/fumevedekelokisarusala.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/40128452258.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ppa9jkshaqerptkhscbd5ppt93/74073004927.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/dorilin.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba34355e16---61339356325.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/1768972557.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/4686189279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=macmillan+collocation+dictionary+pdf+free+downloadPDF 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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10808 bytes
SHA-256: 39ebce523187269888b7100f38be22526918c86e1079b7d4f022b50439a482cd
font_01_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 19320 bytes
SHA-256: 99c373d7a96624dc3c53ddaf2fb70b0d4c59cd6115da8ea9ecb85a99ab4712c1