Malicious PDF — malware analysis report

Static analysis result for SHA-256 691333f5ca672b5c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4282a3ed3ac3c7be41227b1f3ac25d7d SHA-1: d113fbe0fc8fda52ec6d9b07424940386a4ce124 SHA-256: 691333f5ca672b5cbe53812c9ce92e5095a312e479a7c057cb82b01b9ccc91da
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lblussana.it/images/file/1992118138.pdf In PDF document text
    • http://abyss.sk/userfiles/file/pufosorufopigomabaz.pdfIn PDF document text
    • http://davcpundri.com/css/file/93733996651.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/23354668942.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/buzifomesupupopaf.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210703184719_67keka.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/85903818538.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210709181223482.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/rezabufotenigi.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/vivekizijawewazoxemo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c24567ad3c3---somunaduw.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/pawiwuvuxewe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed9660551e---dased.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/joluwo.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/52594864998.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2cdff4e---wejezomepotusakitudew.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/44076576158.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/31798262932.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7808a9d0f---dinineg.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/napeb.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/j6qp4k12tddrm9v8emsnfqg9u5/46399519129.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a39a47adbf7---16280918000.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/81568162033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=group+4+syllabus+pdf+in+teluguPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11144 bytes
SHA-256: 693b2276f524c51ed2bfa61785674098949dbeff0d64d0c914abce1472cea489
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 18640 bytes
SHA-256: 2b431c494c7cc8c46ad25107c5f87c78bfd47933fb423b749b910fd68317df4e

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