Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe98d39bf3850412…

MALICIOUS

PDF

73.4 KB Created: 2021-10-03 03:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8b613c857a27bdeea265bc5a1f960eb7 SHA-1: 1c58bce022c487e774acd1b1bf69844cf397898d SHA-256: fe98d39bf38504120fbc73db26bba16da81c3333f553da50d5985bd60346f8ee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to potentially compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://studiogalata.it/userfiles/files/43888651176.pdf In PDF document text
    • http://kemmurad.com/webroot/img/files/32985955330.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904220035.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/nivepefekaxemubosivusibap.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/16752819822.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/zeliropeti.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613513ae4e8e1---jumazovevegawisidaje.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bimaxoramalitadobiv.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/66309878616.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fosibagevedanizorekok.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16151775023e72---sawokerunaluw.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/62809996887.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/87410838408.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/nozanirutesizil.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/tidejesododebom.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/ginerifowetulejiwedodunaw.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/melorepisefufazowep.pdfIn macro / runtime command snippet
    • http://stilistspb.online/public/files/uploads/files/90980176274.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/56777630650.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/tafofevupazimegajojosajef.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88c2cc657---25500310807.pdfIn PDF document text
    • https://adikketiga.com/contents/files/14236656652.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/54704789936.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/02b6c963e11ee897aea7e7b127fa1a83/24604794438.pdfIn PDF document text
    • https://eghamatyabIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=star+names+their+lore+and+meaning+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_off0000b809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 11020 bytes
SHA-256: 057c90b59d7e0e9fc94529cf57db1ad306ff09961db35b5bc9cfa7ed875c7e41
font_02_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 18320 bytes
SHA-256: e3e3df7a372b298fc8d36f0e47199d76f8866a1128e50bdefa2a8d1a51bde19a