Malicious PDF — malware analysis report

Static analysis result for SHA-256 91326fe07b3a7c5e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 18:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a60da67b30afbd2727fda9429b502568 SHA-1: bf48bb6db7a80992149aa16025a5314b3f8d33e0 SHA-256: 91326fe07b3a7c5e671674bc5f2aba6ceb518405b8a79b10b4ba27bc486670c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely disguised as a job description to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106e7bb56b26---85793040894.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/134dq2jb67bfhdue4fb5pk0gp6/sakotewurez.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/63063485322.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/jipurazafaxuz.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/jimaworek.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/44356168770.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/38584406816.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/kukokovul.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4h53c7te0h722jc4ga7s9pa0tf/zunosifu.pdfIn PDF document text
    • http://lovesenergy.com/file/suwir.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085edb116860---82215974439.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/49181592662.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/fekupor.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/sudumewaxari.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/96ea80de74a476d86439aeaeb3d42c71/jonofojuzibiza.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/51670312355.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc434ca1432---vawinev.pdfIn PDF document text
    • http://www.siposferenc.hu/html/51486633877.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/26629251520.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210603041023_659189068.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/tojazubikiwasunope.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/xaludigukuvosozitopubewox.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/94934789747.pdfIn PDF document text
    • https://samowar.ch/upload/file/zidoxulozevigodo.pdfIn PDF document text
    • http://handinhand-daycare.com/ckfinder/userfiles/files/fokapolexile.pdfIn PDF document text
    • http://pi-consulting.ch/download/duseverer.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/tefevazujak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=counsellor+job+description+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17736 bytes
SHA-256: 013afcb8eb8cf72bfe3eafe9f35ca9d2c470fa35d50c6e46158a270348176340
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 10852 bytes
SHA-256: c847f38a51bcb88756d828bbe93e250fa72bead2f813f57aed6ffa58930e1953

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