Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47def7624129bee…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 18:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: adb402c988ead1d69eaeefe7bbdff3a0 SHA-1: 681f8b8b48fff41f436062303b3a2b9e2bdd9c52 SHA-256: f47def7624129beef093ad7735f1dd1226d448ea0535ff48a8ec5a0ef19f6cd8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The PDF structure itself does not contain readable content, but the embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fd016daa---45316556350.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/relevo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab632424e---ranibowulazamazuse.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cldr7tdtiuokds3lvfi7ijaboh/71662828504.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/koguvazeridoluwamedex.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/mimopidirebopuwe.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/pimudawed.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nf657s7o3us17sb3do0vf67jj1/rafixezojinu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d13103f312---68603836665.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/29082346907.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073a92248c3b---zuwim.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/fj0q2brvh30bh4pfogd1ocvit9/jopanorurewiguniderivuk.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160777333a8be5---weborixubutelabusib.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19336635480.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/13c77bcb93cdadeeaac6bcc8b5b00ee4/27288114767.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/73923748303.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/wetiginifina.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/82606324711.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/19691016814.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/5ukrin5di368c8t7gsijcg0lu2/suromujugujawapisobapu.pdfIn PDF document text
    • https://maturana.cl/upload/file/gupapivugofewudinaxokiro.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/85491892732.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b8126169---79608882820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=500+sit+ups+a+day+for+30+daysPDF 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_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 16844 bytes
SHA-256: a7b6d169f53fbba3c124d714fb0b3a0cb958bf44e7a8c66e1c7516516bf36661
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 10756 bytes
SHA-256: bd0b6d5c917682b9539ece7dd2c929d32b0313f7f72f29502e2b7c5a685acb5b
font_02_sfnt_off0001393e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1