Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0cab7515f874a3…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 22:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be2276d92dab444a85b177fcda971a3d SHA-1: be4de379366ec9736ddd68f6f01c6c96ad8acc85 SHA-256: 7a0cab7515f874a3f94138a6df65a6e763ff3cadc1b7d56e7e05c0759b07ae1f
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with several URLs pointing to compromised WordPress uploads or disposable hosting, and specifically mentions an 'advance-fee scam lure'. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and URL analysis strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://archism.ru/uplcv?utm_term=android+app+launcher+for+windows+10
    • https://newdesert.pl/userfiles/file/bexoxedofigo.pdf
    • https://copacndg.com/images/uploads/files/85600424124.pdf
    • http://miyozenemeryville.com/uploads/files/sedukodatigodepugolir.pdf
    • http://news-hk.net/uploadfile/file///lezefidusazogo.pdf
    • https://unifor975.ca/userfiles/file/10322070307.pdf
    • https://bepxuyenviet.com/upload/files/90331234917.pdf
    • https://dcoderesearch.com/uploads/dobasozapazozajukudizivid.pdf
    • https://stka.gr/ckfinder/userfiles/files/vaderubaxa.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390a224084a---32435570983.pdf
    • https://foundationkuzmanov.com/files/nokizotafatawesu.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/22704681352.pdf
    • https://tinhhoaxanh.vn/userfiles/file/70674337360.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a00b180d9---86044582326.pdf
    • https://zoldlepes.hu/userfiles/file/puzuxototado.pdf
    • http://capitaloffice.pl/fotki/file/58725366364.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffd0827ff---wiled.pdf
    • http://beauty214.com/uploads/files/202109141218307414.pdf
    • http://studioiulianella.it/userfiles/files/zilofafidifutaroxatev.pdf
    • http://naturalwonders.com/uploads/files/87969714604.pdf
    • http://improntediteatro.it/userfiles/files/41895583892.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/xurinujovogere.pdf
    • http://slkuang.com/v15/Upload/file/202192652164014.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e071.bin
866ac21112b559a14c03909e54847423a97e6031129326432eee46603f282eb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 10960 bytes
font_01_sfnt_off0000f9dc.bin
d9ac8a7235fe978973673d6e90e62a1fc31ff5d23eea7b5b4b10c9d673c9a8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 17688 bytes
font_02_sfnt_off000127bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes