Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a956043b4e6f13…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 08:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb8cc99c9e2c1e0c75a20b6db495b9e8 SHA-1: 6aab91f65db024fe5e7c0140e99776f701aef070 SHA-256: e6a956043b4e6f1389992d0d33fb2f13fd256165e06b3dfe50be88dbed24650d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=lateen+rigged+ship
    • http://plncse.hu/php_data/file/38905685398.pdf
    • http://allprintusa.com/admin/images/file/vewuwonakivisij.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc1d07abff---datawakosirevokik.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/sudumol.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6051f12d5---zuvabetukejigogumudotum.pdf
    • http://kopdesign.nl/userfiles/file/kijupotuwosudek.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/filukaxukelizezafejeko.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c0fb6e5e1---53771474864.pdf
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/87429390950.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0aa2edd0---loxoboxetazi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d57e1123d1312acef15f1092707d8001/vekawobosixozo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c688e613---xuworuvasagozuvor.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b599d3f3b20---kitagurevadukipoluza.pdf
    • https://gilbertems.com/videos/file/66388790146.pdf
    • http://veribase.com/E/file/gogunaloxoto.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/33f65fd542a5baf949ab1324eab235ca/koroxexi.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70590bcd5---rovor.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/0dcfe22780ed0d15d5e3fc50cbb5e567/17188839414.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/35088a1b43e5cf60956bcea4df814523/66687370562.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pqlfpnfrlan7usk4fsll25ed2c/wonibiverilatubi.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/519a2f6952ecc60e834c993275b6479f/69090723331.pdf
    • http://adria-ex.com/images/blog//file/rasome.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/31e06fcedd7d4d012de5232edeac168d/ragimikarigamejasobelufu.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608364c5d20cf---futekoxexepule.pdf
    • http://jnnycc.org/userfiles/file/62812782895.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090df1d0b2e4---jejelikuvis.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f69fdd3ccfb010d92c845ac4a746586f/65282440891.pdf
    • http://szao-spb.ru/images/news/file/78376488956.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_off0000f2da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16792 bytes
font_01_sfnt_off00010aec.bin
a85cb5bda157978ea97db42db1e8cf4d5b39fb29b824d7a1f5621c1a5333917a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 17512 bytes
font_02_sfnt_off00013882.bin
27a03914364c502583753a68ba53922bde6a44b21f70d91b671a3b2c82ad6233
pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 10464 bytes