Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa1aee15a84ff87…

MALICIOUS

PDF

90.3 KB Created: 2021-07-18 02:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e4d6f226b9828b6b7563e299cc44374 SHA-1: ecdc47ae0d8a253b24f7227320712012f36fe5a2 SHA-256: 8aa1aee15a84ff876bdd1ff063826c815dc35dd130f795d4c080ead6ab28ac9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised upload URLs is a high-confidence indicator of malicious activity.

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 https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4db63da9a---komixubofa.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jgniqtd3ilhsbvnk5gbnl77r88/wivefibikusosipona.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/558c5cdd28212a9440c9b66b07a4ac4f/jaladufavatenovinub.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a323ed3a07e---pejanomimafo.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/folixivixirofamume.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/73211231259.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6df5460d35---fifejuxuliw.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085d720b82e2---10023424574.pdf
    • http://dreiseengrundschule.de/files/pasemijoli.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ac5642a4---27253987922.pdf
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/pomafejobenibefoviwiw.pdf
    • http://mmprogetti.it/userfiles/files/3068944554.pdf
    • http://ahkjt.com/upfile/file/rinujurosaponal.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702698d9adc---fiwuzap.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa49ad030---togijotamenededuragudopi.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2654b90cc1---27953538045.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4fab9b073bd42fd72dd0bda9a240a7a5/88903525466.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f76eb7f3---notulilawujugejadef.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r74eo9ns60pj7151hnre12su0/guluwutokeromuropu.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cf165c18f503fdb3ac959a2108ef2974/wumal.pdf
    • http://memphiscentral1969.com/clients/865565/File/24119265827.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/91447551175.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ff180a6f---nosisinelekuloma.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608022cea1804---rusufegotelikizopo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+performance+psychology
    • 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_off0000fefe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
font_01_sfnt_off00011715.bin
36f1e38b92ce0dcee716a12a62b0b2d3ea74bd1f3242dd0b84d1ac5a610eefa5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 11032 bytes
font_02_sfnt_off000130a3.bin
8035b89bf7e497e750cb91c08f97e0a8d010f6c8bd42cd1e6964cc83aa0105ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16752 bytes