Malicious PDF — malware analysis report

Static analysis result for SHA-256 6956cec3905d164b…

MALICIOUS

PDF

93.0 KB Created: 2021-08-08 01:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8290ecec2db4337b24a727cf2ed9cff7 SHA-1: eae1703dedfd2204f00c22ad12c4722bf3dffd97 SHA-256: 6956cec3905d164bc9303183558b32a0ea8ead064714bea31ec5bc0b0e54d1b6
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://igigeothermal.jp/userfiles/file/dumususari.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af723c549a0---bufuzokubokawipevawaritap.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/lozovax.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/56751048351.pdfIn PDF document text
    • http://beiks.info/public/file/lokelegakinowa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/id1qfj30agd6h5c2inmmrq11n0/pilanowujefapaxexu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/dunukijazej.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/59407824827.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ct8b7lqtah72jbpcrh82d5l0hu/kibul.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/62577010349.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/pilamenetule.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/29582104864.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sijivakixolevub.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/67b81ba95d929e0f80976fcb2f5a3fac/7302125852.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/73ff2d347d3fa094b7eb16f22c617d15/87457837901.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kabalipap.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160849cdd54a63---76210349671.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/tuxifogud.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772877bf56---lumelojuja.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/e08dee80bd391243efd8b7b902a1ed17/lemegefibewun.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/4625759367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=punchline+algebra+book+a+answer+key+2006+marcy+mathworksPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c48c4d4c5d9b512d6e9cbd0804f1423e/63756041633.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_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 11620 bytes
SHA-256: 5da73114e8433c138d1fecb817bdee1415f5396bc74c684f1a983caaadc124c4
font_01_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 17856 bytes
SHA-256: 643b204ac07096002aaaa100e3875ab522d4e87017d73c5e41256e94fc4590ef
font_02_sfnt_off00014cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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