Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ac241a846f609a…

MALICIOUS

PDF

83.8 KB Created: 2021-08-31 15:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4dd0149b13e4054482491b9750cf3e4 SHA-1: d4f2ade12ef87397b846dbdecb0c38541d296d18 SHA-256: 89ac241a846f609a7403accfe943194f008a33dda126f89f0ecfdc8ee5e3398f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware through the linked sites. No scripts were extracted, and the document body was unreadable, but the presence of a link farm and high detection scores are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://doitoutdoorz.com/file/NkJKlyEfp0SpXZLw.pdf In PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210825034630.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/tamuvovivunikokudolazem.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/36383246099.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/35255400514.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xetafufesikajurej.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/68972608339.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/uoiaio87m1t8tol3kk7cskqv71/56785935661.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/gikur.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/22fa228cd7ff7d38c567ae543002948a/28214356862.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607001b47bed9---paxojutejijas.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/36102043084.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/50181779920.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/1180432998.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o0bp839hkam2uhnere6v3nk764/45390494340.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/98775418813.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/foguvebosetuzulakaneraned.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210825_8B45CF9B7CE044CE.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc23cf73e---95269811951.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7fad4247---2371491590.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/64954388953.pdfIn PDF document text
    • http://houselandia.ru/files/52271619538.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e67459f904d1e6189f3b2184148c5787/91266097925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=decree+meaning+in+the+biblePDF 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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 17940 bytes
SHA-256: cb2b5f462b407c835549fc6762ad54dd6ca0ecabdd0bc0d42384bcd3a70783ff
font_01_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10528 bytes
SHA-256: 9126b474a91529d84e6820dadb857ef42ba2a146b54861dba07c706f3d2c7c29