Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83c61a57ca80848…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 14:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6798784fdecb1f94326357b0e80fc2f SHA-1: 60558ca1bc2e0d774a7dab5e707a24f9e04a5b17 SHA-256: b83c61a57ca80848802dfaa4bdeedd3b9c9f29ebfae43cdd8e175f5d08da7c77
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://designerhouse.ru/upload/files/5584379150.pdf In PDF document text
    • http://herve-coiffure.ci/files/zopexurinabekamepowamuka.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5cfcfbbe---58072037156.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/18670301667.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/bawaxibugogapiwuminedobox.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614220138f251---83034286895.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/daborugukizokuxugamel.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/wimobanukobunaru.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/58382039855.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/84118019711.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832357289f---85025932454.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/83996940835.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/15796567394.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/12478864701.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/mekupupufirasozimagetif.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/52710673741.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/zavevoxafaxivoxawipufure.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/pekujuvemodoner.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lebebugekiga.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/nabajoxutigujut.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/97265814488.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/12027638889.pdfIn PDF document text
    • http://wohingltd.com/userfiles/58329630009.pdfIn PDF document text
    • http://gotween.com/userfiles/file///perugaxarilotawidasinup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=airis+kira+n7000+androidPDF 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_off0000b46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46F 16524 bytes
SHA-256: 4773c52a00b90505cca7caaf4eea931c20af616c409c2871850e2e76dbadbe14
font_01_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 10208 bytes
SHA-256: e9c9f24d491c6265adc4c83d476840bc7af5b8c5b0b9fdeda804ab843fec80ac
font_02_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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