Malicious PDF — malware analysis report

Static analysis result for SHA-256 52994ad7c749c801…

MALICIOUS

PDF

95.1 KB Created: 2021-08-15 19:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fadbbfd11e35ed8780e9309d5cf088d4 SHA-1: 3a8ec065863eb13f75188a9c87408c14f2de3b05 SHA-256: 52994ad7c749c8015dfa8f2677b05af702e751163f28a911b87c3e63eb506c10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the hosting suggest the PDF's primary function is to redirect users 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://pistant.ru/uplcv?utm_term=attention+to+detail+test+pdf PDF link annotation
    • http://oreade-breche.fr/userfiles/file/90647662413.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/zodobirene.pdfIn PDF document text
    • https://suksesunited.com/contents//files/86478706481.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/82084774237.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/74588917496.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/budowobogirunotivapadadu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/p7ukvqf74p85mlv1h3qh3k989a/68339266483.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vesogu.pdfIn PDF document text
    • https://lecachet.fr/docs/files/72055317129.pdfIn PDF document text
    • http://aplus.to/userfiles/file/57733036530.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/57904717497.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fifeserupesedorutizeruv.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c75e049971cd36a9e99b6a2ecbecfc1f/mojapika.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/vubebamarimaxizavipenava.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608991ee173e6---81261316574.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/60642156238.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/45482f3768c646945c9d9a4a33a9e59d/64037474105.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jikubukuwemewule.pdfIn PDF document text
    • https://wsbtitan.com/images/file/ludezikunel.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/76026652226.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/e1bl4kn8noai3mp424cato4231/84055128526.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a68613a5078---55486736696.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1f65ea29b---zegani.pdfIn PDF document text
    • http://micruts.org/userfiles/file/wugazokogumik.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_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10372 bytes
SHA-256: fc441be4b3ebae5714abf4229c9ab575b2cf7f974312090f7918804bacae1c1c
font_01_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 17740 bytes
SHA-256: e8d2ae245ddd31f000d082127533d03cecec26046547424f22770a0789e5d7f0
font_02_sfnt_off00015379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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