Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf3f352f8c683a9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 08:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 799c979244438f2a2afb4f1cc165e24c SHA-1: 0d0d27b942a754be6a2b457300073f71c4ba40b0 SHA-256: bcf3f352f8c683a9f92ff1fcd5da4163463e312b70ae801eb3ebdea4fcb9210e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised Content Management System (CMS) upload directories. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised sites to host or redirect to malicious content.

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 https://synerhu.ru/uplcv?utm_term=colour+by+number+online PDF link annotation
    • http://caphegiabao.com/upload/fck/file/15547466204.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4tp3rqqapiehv59r5a02tm73q4/67075231164.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/82044160214.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fafda9843---90524525695.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/61518994773.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kaforinezasuw.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/42113963250.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/i5nh2dsk1eujn47hjvidopmi8v/tapudiwidunejokesij.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcf0f06c579893d7550ab101a37f3441/39852946129.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/57497568420.pdfIn PDF document text
    • http://biomisszio.hu/tmp/84414614801.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c386c9e378d7d92cfa720b10643e7b6f/39022194554.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1778eb91---49391946196.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/47452283532.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d813c0ef6f4824bf090dbe998e27ddc4/33345966990.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe3098757---29450399975.pdfIn PDF document text
    • http://klinok-saintp.ru/files/xadiweka.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff269c17a6f---pipobafuwuvulesi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881ad7d97d1---vasejozesogofade.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e0168d86ab4a9fcfc312f61f3a7a66c4/tigibigima.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/671607276689eab913cdfb4188f144f9/37703099440.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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 17368 bytes
SHA-256: ea5988048a2c2960ec14cd0fb57fd44611a699ba57489ddb7bf5eb925d8cfe9e
font_02_sfnt_off00011c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C26 10224 bytes
SHA-256: b95ce4387d5f4f045755c163e7ff6f34625ec3188bca165a9f94f0fb4301a99b

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