Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5640f877d40f7c…

MALICIOUS

PDF

95.3 KB Created: 2021-07-07 02:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d754dd68b909a163e7a280bdb958468 SHA-1: 3149de7d4fcda429af8fc751fb0c5098d00d8173 SHA-256: 3b5640f877d40f7c2be80938e87e71316d424373c1dd9ef3c7c3e32ee6a4bc08
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest the document is designed to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9491

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://lakehighlandsrw.org/clients/863582/File/48447144164.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980e5f348c3---buvapepavurijozowu.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/35350865562.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xogetino.pdfIn PDF document text
    • http://devison-matras.com/upload/file/15697054608.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/ratelemuzujadenaxu.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/90508851036.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85e2ef8ef---7943445197.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/radazexomuka.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0286c03b4d---bugoxodunidowowomukosix.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qj0tu7ubcsbs6gbv4c92ldjvia/76709244004.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ccd5860d73ec3ebc5abb673ebeea18c6/morasamokejirajix.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528063719.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gerugemuto.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ed76eb6955822a5d88545b30b6f713fa/89907734735.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092358241d29---50329011236.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fa2bbccf9---46561636193.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071719391c5a---21915159789.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/fezagidalizenitibubasora.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/99075756274.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6042ea786b---tijiworefudo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b61a0dd6a---tunotofidoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c955644fefd---12564034518.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/dpp2d0r5ihs521hv2l8kv05uh4/toviwipaxovobaledovuju.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b5a208b92---8876832939.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/81023406989.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/37840394022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+dim+wittedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010d60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D60 19244 bytes
SHA-256: bd1b4972b04abe8b76f3761435d819af6387e30770826ed7da702d20ab8906e2
font_00_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 26900 bytes
SHA-256: 9186b0607144413af392079bf66f5c7de087b2860cec8166845f7db29acc1ccc
font_02_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 10464 bytes
SHA-256: 4b3824e3e386c99df7218a1b56fb1ea709a6a4e6211edc14097c9d9829312e54
font_04_sfnt_off00015cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDD 4912 bytes
SHA-256: 475d20e2b6f2446531060f8e60861cd5856c80def821edafc2b0e5e9b7dca1f3

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