Malicious PDF — malware analysis report

Static analysis result for SHA-256 d442a6dbf6a264ad…

MALICIOUS

PDF

89.7 KB Created: 2021-07-01 17:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8f30fe0d7f131c867bc41418ed345ff SHA-1: 827cefbc3db8d19d197d67b7117a7a77853e0711 SHA-256: d442a6dbf6a264adb8655c3183adf0396adeb3492b9a30def663c87bccd4267c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload directories and disposable hosting domains, a common technique for distributing phishing or malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://evohome.pl/userfiles/file/32796147364.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e203d1d7---36140818810.pdf
    • https://energooptima.hu/upload/File/94801190320.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff6dd6ee9f---80727347124.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfacc7ee3---zulumobadudenewunep.pdf
    • https://fablab808.com/nbloom/fckuploads/file/fogiloletirunirob.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/83614046382.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/c4uiq9h815solm6dg2g0846ukl/ponunovunulu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa8536f59---62811257723.pdf
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/tukorenikawixol.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cc25bdc9171---wokaregipona.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/f0va0ed2thg211n9lsb8l85fkn/seruwusugojenivovet.pdf
    • https://bitree.com/ckfinder/userfiles/files/sepipikomafuzadugorit.pdf
    • http://taiwanglassgroup.cn/userfiles/file/50104176609.pdf
    • https://unibel.pl/pliki/upload/file/tosetawozazef.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/381skqi4vnrkb3evp2fiff9vpv/ridaki.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9112175a28---fajukibol.pdf
    • http://aklond.com/UploadFilesfile///2021042910532858.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca05b6151---famusixi.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd7b8035e---wakemoludufokebolasima.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vatifi.pdf
    • https://triosms.com/userfiles/file/dopugelelajomusufipotin.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6859417f2---nafibasitarid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=anti+personality+disorder
    • 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_off0000ffaf.bin
c31efb0f1ed1362c34749bf091e0d4504dad4209354fe8386c74de9fe971ac49
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 16172 bytes
font_01_sfnt_off0001297e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 16792 bytes
font_02_sfnt_off00014195.bin
ab44698959aa0c0da9bb51567d26c7f37c91d12a6b84f09e0ae3cd4454bb15a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 10480 bytes