Malicious PDF — malware analysis report

Static analysis result for SHA-256 77378c05fd3ca86c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 15:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29da1da8d71e265ffbcbe0ff2cc22022 SHA-1: 5d3ceb0384a38b561d543b8340ff0b444ddb2674 SHA-256: 77378c05fd3ca86c4e4909bb2a756ea9715faf2dcbd955d1ac50179ab99a2cb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to act as a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dolnoslaskialarmsmogowy.pl/imgturysta/files/48108567381.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/2329772126.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/dadogejugoxajonudivuder.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7a5a678e07343dd4c498794b823dd9c4/10498369096.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daaa5224fd---tibifefax.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/gevijajafodolifegi.pdfIn PDF document text
    • http://bscartridge.com/pic/6032171098.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/vixowekutosamogokowen.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/pimixasegosenivivizux.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/sixufajexewitujone.pdfIn PDF document text
    • http://innotack.com/userfiles/files/71604364474.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/geg8d8fdse3ltohcsqc4bfgpt6/23578258745.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160860b3e9c939---selijuxiwusafok.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c8b9f1df55d2af74f4a7e1a9239c90d6/tulelanoxusaretobirujil.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9b2a2572---volezemimelogu.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/99125166413.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/72841500544.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/61e75557e1e0afd25f2c52a7899e7048/22528225891.pdfIn PDF document text
    • https://o-dance.com/upload/files/pumebomivosefirozufelive.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780eaba4ed5---79250242506.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/050995c7e909e794d99f3e56b0d79d19/11700413122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kiran+bank+clerk+math+book+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_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 10940 bytes
SHA-256: 2676e9665bd06a154b3630d6d633397c5f30483ca70a455de76dcf983d7dc184
font_02_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 19160 bytes
SHA-256: a420d1287118dd2c3d381447157b665c817826528664d0ee1e271212819d4f4b

Open this report in the interactive analyzer, or submit your own file for analysis.