Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a25b2293486c0f…

MALICIOUS

PDF

93.3 KB Created: 2021-08-09 00:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 564f20f72d36749696506168974371f9 SHA-1: 6565335e33c634799e6c8ea3fcb883d6f3bdf80a SHA-256: e3a25b2293486c0f26be0638160ca14007dee8168e5c8910d319ae6a9e2559e7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://a-xian-coat.com/uploads//files/202108080827236313.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c228e83630---bobeposab.pdf
    • https://mamo-tato.ro/userfiles/file/8445624514.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2697e65ca7eed5b79d6836a059b9b8d3/gomudegubodoxud.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad29c2742---minamekatajopodipapa.pdf
    • https://absoluteanytime.com/media_file/files/files/69097992132.pdf
    • https://0a3exp.com/upfiles/editor/files/41117374633.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b1579673afe5f9d996233cca143ac019/5008792095.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41175cc6a---gizuvojaw.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/79843730582.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b306c029b15---zejeralobepuvamimetinetuz.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/tl82o3f355ot61mblrhok7homb/9017308765.pdf
    • http://universalgroupautos.com/files/others/tazuvigokileki.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4199avt5bhba52lfnj60ubm0t8/rumarezipuxaxibefomom.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/80e464c7f616b65022dfe6b8e0a88aff/zugafo.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be8a9a74c9a---vekokoka.pdf
    • http://singlesync.com/userfiles/file/sugewefoxawasexofidis.pdf
    • https://mediaget.ru/userfiles/files/48478712369.pdf
    • http://retroldn.com/userfiles/file/mitarivufi.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/77732964141.pdf
    • http://allnatureint.com/userfiles/file/gobopud.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4197aec8e40fa748e1685630eeff0455/56029073984.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=xenoblade+chronicles+2+bringer+of+chaos+guide
    • 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_off0001089e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 16792 bytes
font_01_sfnt_off000120b0.bin
332bbc9c3e717b714e164392dd20545cd69cd3a47046db44aa179346897c034c
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 17440 bytes
font_02_sfnt_off00014dcd.bin
6b26019e3e494b895731758035fec6e8ba9c11c179bfa445309ee0aa89ad3058
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCD 11024 bytes