Malicious PDF — malware analysis report

Static analysis result for SHA-256 504c86f794259eea…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 21:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fe0b3a6c9986bca25760b0c4c2de5a6 SHA-1: 395e710b2409d6ece47182a470bf62f267f6bf1c SHA-256: 504c86f794259eeae8d5effaae70f59607345d7192e452bf40f07833cde1d5df
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://noithattamphuong.com/upload/files/88397999342.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8f4f54a995e30c6ed4331079b1cc02d/99931298979.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fed0e2f6324b05c3dd8b692a204a9faa/birimododefizaremaz.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb85b6e9d3---68937398690.pdf
    • http://prosquash.by/data/xaperisosiwurupawe.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a81c0f2b---87567851820.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/j5ge5jejuac0egbql69nacneb7/rubizemupisoj.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af5a7dc5f47---16126142834.pdf
    • http://coreaad.com/DreamDataUpload/file/89174030836.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b182920ca9d---48261606485.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1915d56fd7bd5a86e970a8bb9b32e59a/16242498537.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/xajelupipun.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b6c87994f4ac4b497372044e2a378470/pateluwij.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/b7a11b40e1caae57cd6e622b89767f99/65589130770.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb6977f3ec---64673946805.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eelvvtb5g2t65bed54pfr6u7m0/14808204422.pdf
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/lamugalav.pdf
    • https://medtek.vn/storage/file/11406769248.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7ae707f75a4f256923e28f91fedd7d1c/40430864993.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0698f32819---48225064723.pdf
    • http://alt-1c.ru/userfiles/file/56242419344.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b337dbb08a1---lareroxiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ovarian+cancer+symptoms+weight+gain
    • 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_off0000edbf.bin
244551e1bf1381f9317bc99545b288852c7d540cc87d98277d5e0faffb2cd991
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16756 bytes
font_01_sfnt_off0001195d.bin
a184c0e501960bbd24e00cc26d6847084a0c9d554f9e6b8c263bf0a552faef54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1195D 11064 bytes
font_02_sfnt_off00013316.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 16792 bytes