Malicious PDF — malware analysis report

Static analysis result for SHA-256 141b1ee7892e377c…

MALICIOUS

PDF

100.5 KB Created: 2021-09-04 23:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51f0a7977ac4f7aef2e7c36724c5cdf8 SHA-1: 875d5a728c861950caf188d826c342e453a8b3aa SHA-256: 141b1ee7892e377cdc8fa1843a44686cfbb09aeb7fc4d60a39f0b372b9f7bd26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://bhk-aindling.de/userfiles/files/vijoxeworedujorewi.pdf In PDF document text
    • https://lusagroup.mobi/images/website/user/files/1713144731.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/biwedibepuzupafezosexaj.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/52979118482.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ci3akbdrk6dfrpkto07qq6sfq0/62524480653.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8aede8cf---76474755737.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/48847893457.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/7ee5789991dfd127d2b95de879a56606/68222509877.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6937c958e---73134587982.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1at8k51ds94ersfka21id32ho1/16125965221.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb2a14eac---86714877379.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210525075405_234266861.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210806_112759.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/74751847617.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/89047814932.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/048877712ac4fe85325991068a6cf992/xesij.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa69002435---tutuse.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c0afbcdc8---wujerif.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c2e220b71265e69aec4f75c2f0e94546/sixetevof.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759d2ae7363---ratoxizipuforezosevo.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/734d818e51b85ce08e7a10c23484cd69/nuvukowupufarefefidubeluj.pdfIn PDF document text
    • http://93564497.com/userfiles/xadozazatomud.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d1c038cc79ecf1193bddb455c785ff2e/30341733596.pdfIn PDF document text
    • http://charivne.info/images/file/safomojejilesa.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/gurobuvav.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/19981825393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=le+symbolisme+ma%C3%A7onnique+traditionnel+tome+1+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_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 22468 bytes
SHA-256: eb8921815767e9c3458d836a93370d2987afd24630837a1eb5c91f01774ed1f7
font_01_sfnt_off00014eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CB 11368 bytes
SHA-256: d01cd2ac325cb4e6001588bcb41ed7a44f82507d42490c0a960a78a5896ee57e

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