Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5da1a9c205b56e7…

MALICIOUS

PDF

86.4 KB Created: 2021-09-07 14:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b64859bf357fe884c23f54c622b95b2 SHA-1: e73a9caabcf651e5897c0ee4e53d64635341d26d SHA-256: b5da1a9c205b56e7e0a176ef9d5283beca4832096ad7347fa394777dde7fa6ff
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains numerous embedded URLs, several of which point to potentially compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links indicate an attempt to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alutat.com/data/file/rekuka.pdf In PDF document text
    • http://avision-italia.com/userfiles/files/porezuzezazi.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/371a0ade439440d645c322ce81951e2e/terefav.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516150031749564.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/rumow.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jezimumebajoxisop.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gajatusuxenikivarumukona.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e5d36ccc---neduradinufuzekonet.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nevovukekepevesanivupu.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/14165868172.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/pogunawilogubilaw.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/3421556967.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5faa03610---vizorisude.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e788e213435---gotemoloforuvuvujekute.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/wubumaf.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c83014d49---poviwepizara.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/vekatibetuwimowekila.pdfIn PDF document text
    • https://rcot.org/userfiles/file/mikafusukuxegalox.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/nasaga.pdfIn PDF document text
    • http://samtekelektrik.com/files/toposenaredipisozesaxoj.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/besat.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/36224858641.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/2083577be8669ccb8047c56efc9911ec/siledekaregalodamas.pdfIn PDF document text
    • https://paperland.bg/uploads/file/noxuba.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/869046617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dse8610+user+manual+pdfPDF 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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 17992 bytes
SHA-256: e3de132e96fa0e82e55e666db0a9d211e5bf2924453db4fedfd5d29b9f20c54f
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 11000 bytes
SHA-256: 9e2659d0ca9fe186c03417b3280d7a47e0abac8d36c59810f7084c9ef31c2dc1
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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