Malicious PDF — malware analysis report

Static analysis result for SHA-256 4635a4753b19c650…

MALICIOUS

PDF

88.7 KB Created: 2021-06-27 22:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecf8c1a3553498572a1756f95c8bf79b SHA-1: b19be157585f96a27915172767d7917d2cdb8226 SHA-256: 4635a4753b19c6507f5a1f96a28f02e069563ad37e149ec407dd62df2729583b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. These links appear to be part of a link farm designed to redirect users to other malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d3a68a24dbcb6bbe6e83d25cb0d32fac/tezoked.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f09c9c3214f678f616d4b1d9288ca475/fikarefakavokasovab.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d925094a0---98641080187.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/cd41qlfudg3f0tnubasqnr6r52/8234908500.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b738319f---77536394092.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f963e0d2---jatiz.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/bonesewifelake.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/2401d7c4cdf8afa9865dfc254d636295/68192021023.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b22c1ba9067---bufogebataro.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/22b9c875229e197437271016bc1bf3ff/41535595750.pdf
    • http://macabrey-luthier.fr/data/Files/barukamijefaleloganuga.pdf
    • http://fairway.cc/images/blog//file/nosataz.pdf
    • http://aodaibooking.com/FileData/ckfinder/files/20210622_EB2A1AD6C204F048.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ba6949631bb288cdd62f0fd8c0a2e85c/2580861589.pdf
    • https://netshopnepal.com/userfiles/file/58776781481.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/godipedasugikiwozetof.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4nbcfl5gd843ock8pjuurbu6m5/nemapedabelunupelitorufos.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/nom4t32lv21vhd35v3592qlvva/6395606269.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/fdd43754cf4b2ecb1cdecea87395a5b6/6396298685.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/kavigowufejam.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/xapov.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/omu9p1pmpj5lkk2d4n3r1mpg55/81285311031.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/222195236fcb7e80e51584df2db6fbdc/lakamori.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/15eab07cd9268b7bcc37ac5f6777062e/41417843401.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcaa6d877c---6635624157.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=list+of+chemical+reactions+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_off0000f76f.bin
ad7e1b8c8bf519cd141821d6a7ae8623cc54e0d427be7adab9acf030bac1682b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 17252 bytes
font_01_sfnt_off00012490.bin
8ba7463729287a83dfaa302c4cf5441c73c119243be419b034246d53e365670d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 10844 bytes
font_02_sfnt_off00013d66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 16792 bytes