Malicious PDF — malware analysis report

Static analysis result for SHA-256 c290351c4b862ba8…

MALICIOUS

PDF

90.2 KB Created: 2021-07-15 17:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: db405d20ebcbe4f536fa89b08bceda48 SHA-1: 2a9e2cd5fff789c2fafbc01dbea6d1ef2475ff35 SHA-256: c290351c4b862ba8bbeb4031b79ac254847a3bd06432691e6a99d181300b2d4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df7c485eaa1---bifozapogekakeg.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c734d28747881375658e7db1c319b23/kaworabutas.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9dd9e1e7---8045301834.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/12121aef797355cce691d76d55a05294/marezoziteje.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/djitav8j4krg5o3pvdcnhvkltp/81282562874.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607183f2cd1f3---93966235683.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vijuvijelese.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lvrrgck6lm1vh3edkd8ru22egt/25994431688.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c3599068---vesisajetexediwefeputunob.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/52191236551.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/81972816491.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6146c5921---pisemi.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/k86l2dakajlhhviuq8t2hvc3mj/jonar.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607954bc85e3b---10018334340.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210608_114817.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b0e70543---sakejuxeneseromovorer.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bf39ab31---90643264348.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3895838f75---44824450639.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/91343042823.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210706_2F606E77FD772A8F.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/xitezuf.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/fifurasubo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/01c19c89a40dcf65304ed56815ea0fb8/27795249415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=place+watermark+on+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10700 bytes
SHA-256: 71901d9e48964b33aeda3989cd478827c78d5c3a8bec791ca3ca3cbc421d90dd
font_02_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 16844 bytes
SHA-256: d564d09ad93db98df26435a93e42bda78f318a7006d548bb63788f49cce1be80
font_03_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 16424 bytes
SHA-256: 831e63f55fecb0b3d1e0019ec2c109827478611dfb210189d50957eece711945

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