Malicious PDF — malware analysis report

Static analysis result for SHA-256 34679a14503b556d…

MALICIOUS

PDF

75.5 KB Created: 2021-07-27 23:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8be5d6ea1d4c25714f2cba60a834771 SHA-1: c355d9c4a9e9d1cdf0d53991c2803a51909f61ab SHA-256: 34679a14503b556d73b87bcdf14a4b5d223a00ceacec0101b07a382837214cc7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and compromised CMS uploads points towards a tactic of leveraging potentially malicious or compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://meta-min.com/files/niwudamuwedobisuno.pdf In PDF document text
    • http://araonline.hu/uploads/file/12436663108.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/fc1236803ae03408a4aa081cf904cc8e/13463081511.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607401ce791e7---xedutujeva.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/setalireboxefowen.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079606f0cea3---25623533985.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/zimiw.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/a6vkfaqikn2k1hs1v63ovkt3d4/21571283036.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/59c168f10fa07a072231781c4e927c02/71602140444.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aece38ae26248add3a9b5f12247cf07a/79588394707.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/08472cf3b4d84aff2f0ffe51433da691/juzebuzapanuzevaw.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160fc1f6a46081---pevotoluwigafotizekageso.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fc3fe04be719362bfd8f1158098871b2/ruxetejurose.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6nro7jqh7sbp5s8q7vp3ot7d6h/88366243467.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/fikitibemilubolapokowa.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd1a9f39eb5---77184952097.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/kobowerofalut.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5ea9d6a3---77255676741.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b1df49f74---tozob.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6478f6be---jenoj.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/be1d8a2a7b2c4626a1d5a75e5d48cd5d/sawudodejuvowaxux.pdfIn PDF document text
    • https://ahha.az/userfiles/file/lotoke.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/518994635.pdfIn PDF document text
    • http://fabtur.ru/upload/files/49407669295.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/joxodujipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=zara+zara+bahekta+hai+whatsapp+status+female+versionPDF 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_off0000c3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CF 15924 bytes
SHA-256: a14c787db9770b5f1d5acfedb5be50189268a6e81892834d247502cb7c1fc170
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 11132 bytes
SHA-256: ab77654bcb15e885e617efc454d4477231e649a6ab0932d3e14a5a5e53b0047d