Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad5b75c183a7060…

MALICIOUS

PDF

107.6 KB Created: 2021-08-13 11:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b68476b2c9e006dbd4bc2499f39064e SHA-1: ab3ff24be592de6d784056f11d0577bc6862027e SHA-256: cad5b75c183a70601cf5df9c6add5ae9b1228c3d6b276ce777bfb1b426a25946
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as file hosts. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to farm links for SEO or to distribute further payloads. No scripts were extracted, but the presence of multiple links to potentially malicious content is a strong indicator of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

Heuristics 5

  • 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.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/6df11b4591017fcefebdaffaebf65828/14003374045.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dc0e2dd29---wepovobolulatu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e2cd8fd63---juwerejazimolemukas.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/88798857064.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9215d090---63482029419.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/voduvubuxosotekowo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wolagobosujovefusogevafe.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9540ad30cb---reselajan.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/negulaxa.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/pevuwigekiromupojubel.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e5e2dee3865c962a8d9cb4e36c3ac7c2/21875716410.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2pcsm5artcmnqe2f4git8ggnf0/94037793598.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/biwowawojutatumigizizuvav.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa266b531---fitisor.pdfIn PDF document text
    • http://unseretochter.ch/images/file/fafuzeforoxopubudiwo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ab3ef9a9a620811401bff3317db1b786/72575584398.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608755aee6831---54334836664.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/56669468164.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/rigezatopiwoxijimazij.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jexolej.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/fixipesuvinutek.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/5a34fc6a0235fbbbc86c8f5a6b8676fd/dadelupu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/lm70g2tqhka6btj8ij89lc3i99/niligiwapenewe.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/06356656942c766a4df58a2fe58e53b0/34312563058.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/64780801678.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9fae70b625257e770f7152439c485e22/67980489460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+modlu+survival+nas%C4%B1l+indirilir+bilgisayaraPDF 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_off00014701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14701 11280 bytes
SHA-256: 81f36add0c04d3be6ee771f7f063abe5b163cd11344966f72660de5d82280a4d
font_01_sfnt_off00016143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17955 14920 bytes
SHA-256: 7fd18ac7c003f08bfbe614ef76e8e08fa54e78c65618e09234fb9e449cc7ffdb

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