Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb668add1f3605d4…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 19:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b836ff53db4281881e4162809bce3be4 SHA-1: 52cbd4356d1c50b4bf068d17ae43f1519bba794b SHA-256: bb668add1f3605d4c788f5a380f83cedc0ee5e661f66631be62a9d631318e9a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.supair-lux.hu/ckfinder/userfiles/files/38930148797.pdf In PDF document text
    • https://anjingliar2.com/contents//files/97550735543.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610e224509643---wikamubobewa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2hv10nvbnk8sts0luer2num92/kowirafuzufuva.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ceb5651c85c2cc90348465492bc28939/51661762142.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fd74ebd1297---fepuwiwoxonilapusuriv.pdfIn PDF document text
    • http://built.lu/userfiles/files/36031362506.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/tujutezebeded.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a923518e31c---kadutapopizevuditimapatu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/4bd0e4bf831912a2084dc800984c9d77/wikatexitubilugajagupu.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/62463483709.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba845feeb62---85485409523.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/29289254210.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xatidekosokux.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//96658384745.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dawinenikuwijuvexakobewir.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c23100660---80758863044.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/kajizotodikinegawi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/80823874404.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0e75afcafe4ccb838cd6b549b53e7048/gopano.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/10554392467.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/divap.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/wivofux.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/mewugimekaguvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+decocraft+mod+1.7+10+9minecraftPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 18560 bytes
SHA-256: 92fdae7021e961b03bc2c5310641df3b47840a2305f3ac606f74fde6581deff6
font_01_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFD 10872 bytes
SHA-256: 345376c5f78f749ee5bac629e8fd15c2ea184a9a1f95779502cdd0e41b94abf2