Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff120899e239cba…

MALICIOUS

PDF

86.9 KB Created: 2021-08-18 22:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b1bf9a1ac9f67bfb94c99173ab3876a SHA-1: eefa7532ff8c63706b08e99cb2e820ddd18d9e4f SHA-256: 3ff120899e239cba913d97f37aaf447bd790707433b738c2d6e1d0b7815e5a9a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, indicating a link farm. This technique is often used for SEO poisoning to manipulate search engine results or as part of a phishing campaign to lure victims to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://toyteepee.com/uploadfiles/file/210522200815595879n8vp46.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9a4bc6a0c---17025151526.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d7f89f92---84071004151.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/wabowejelexawafimubexapi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/21935548880.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/5626509235.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/51481116518.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160abc149b2383---rejivotatoru.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6173ba09---7396301741.pdfIn PDF document text
    • http://cke.hk/userfiles/xesutupanozigotuvejugod.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/maranotobovemumiwop.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/dolizozu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fd82e9d7---17874649710.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a256db31f---wobenodibevatinek.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5463a40632b701b700427edb503f68d6/nimiwugunusaruf.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25190e235c---83811864271.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/3c8a71b66eea4fd171959a6c104e5ff4/tunoza.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/navanijixalesukipirez.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/f8db249978898abbef325d4357541642/18852234444.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/49434545373.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28a10bc80b---11837140736.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/buriwunusijo.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozogixowinutoj.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/th2vttb6lsk5reco674lp36iqh/29649866018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+treat+de+quervain%27s+tenosynovitis+at+homePDF 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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 16748 bytes
SHA-256: 4e5b4c71e9fa1c24cef596876573984743ebeff57b6883fca59c7d029dd0081e
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 11004 bytes
SHA-256: 351f4a7aa505c4793fbffff258c905aa2648bdbbc107e59a87500185be4a26a5

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