Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e5bc8a7dfe8a5f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 23:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7176bfffc55f2014523259cf3862b74d SHA-1: 5e2988525234721020dda1c10995a855a27dfbb9 SHA-256: 94e5bc8a7dfe8a5fbebd66bb75456851fc669ae2f895da76ba6a8c6bc50adcdc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many hosted on compromised websites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=how+long+is+defrosted+chicken+good+in+the+fridge PDF link annotation
    • https://www.esfa.bg/root/ckfinder/userfiles/files/98090411508.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/38657673675.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r7hfg0db1kn2omb70rapqelvl6/65107424345.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/38778130975.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/85482454322.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/19347932688.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/ropaxemapamesitit.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-19/20210919131723896885.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/3955879119.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/rizug.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///sugixobavevulowoj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613807dfdca29---vijowefelalu.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/71045745099.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/fuzifapigi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac2735809---ginitetaditon.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613cf44f9d628.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/xinesatulitaxen.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/42328290059.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/8405277990.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/77414390573.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/26553972701.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/36694783954.pdfIn PDF document text
    • https://sanagustin.cl/files/xurix.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10764 bytes
SHA-256: 4c3c2e05fba0012ff8949666f4eb9146c997588937018ed39edc9fe8b0159350
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 17840 bytes
SHA-256: 57ffd6aa560cbd4196269b7d6efe78056ceac92bd93cf4c666b971dbff22ed4d

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