Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c63703f466480ca…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 10:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ff6cccb5afdb23a2726abc73d853a1b SHA-1: 2d95c63f94296f84390b8afd427c95cfe1b47f4a SHA-256: 0c63703f466480ca55ba2265d8c465b5941fc7edf8f0b4db8387d2ff54134725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=street+fighter+2+the+new+challengers+snes+rom PDF link annotation
    • http://supermarketdv.ru/files/file/21665338516.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/925e8ab0112b46ca674642a8a4a2af1f/42707069161.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/78806151261.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/64611111805.pdfIn PDF document text
    • http://chinalabware.ru/d/files/mowozos.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jowop.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079268f780a2---51463822115.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d824eda9dbe9aa65308b84fe82ee83bb/33001548384.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zadur.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jpi44ft2gdap410cp01ueb0q15/rodawo.pdfIn PDF document text
    • https://designclarf.it/file/61707708099.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bi47nq6gccsn48074fvtpk4f9m/34476176211.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42409f44d---51604597755.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f9597e9c0---sosupiwoz.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/baroxomoguxoborigesan.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/tipabupigaxiroripozazob.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c2202864078---96921936507.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876dbd82df2---xedopogizaledunej.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/m3d8mov2gg6ndibfuao7rvv0bq/260433107.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b85e7d07afa---jexezuvarod.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i6lur47tjepb46ehgprqeu732n/98512827021.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/coj1td2op4r8ggu9rgjiuifiv1/66235831888.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/55294028127.pdfIn PDF document text
    • 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 11064 bytes
SHA-256: fe277254f59020cb1f5b6e60b0a63408bf451fec36cdd2ae2be203fc7306b0b0
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 17252 bytes
SHA-256: 1fef8b53e48b78ec13f32c85f1a24223d290af13356adf09a6ca339d1e20dd04
font_02_sfnt_off00013ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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