Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf97610dab1fc0f5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 14:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 841c727c39a7fa327bdbebbc7aa39a25 SHA-1: 0d2368609487c5e9597e38445336070111736c82 SHA-256: bf97610dab1fc0f5d30217197de0592186fb8202ccf147d3eedcc319b60b7bb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 utilizing compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7bdb6a537bd2a3f9f875fdecd08d6f04/61160276559.pdf In PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/pogodilanexokezudusiz.pdfIn PDF document text
    • https://kildevangen.dk/files/65075804822.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zesikibap.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf64f6b28c---14510163220.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/63da93b4f6149b84dda908a61562aa24/virikuxekuroxab.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8b034ef15546b1681adcfa91933f5c85/12430571505.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3nnnl76co1ivqq6dakitnuls73/xadobudo.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/wumoga.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093cef890e99---dabojositevedaxo.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/sutuwusotilaboz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608478c1960c4---80344452762.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b7e3c03a---92447343239.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/livebotef.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/45306299383.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/jewenawewovoxemunaxenawad.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/kelalalerenodagovedefize.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxetipu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/563f21e6f50924aed39ed595faa3baa9/35875066751.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/81613119662.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/sixomejidodekozabebevaxu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/94511152173.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c188c4392---6227811991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cisticercosis+pdf+2017PDF 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_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 17532 bytes
SHA-256: dbb4372cc3f4c3ec7bcd2c4b28eb8b31456a5ac7745276694558d3b54454757b
font_01_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 10676 bytes
SHA-256: 4957abcb960977c3dc753d124c6a532d6592f4c5c1274da7b861c926a2ed71b3
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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