Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c35fd30645700ab…

MALICIOUS

PDF

91.1 KB Created: 2021-07-19 07:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dc9d2016c0fac0c7dae7453355f370f SHA-1: 32038b9c852de9d1b96408ea99ec75ec43f081cd SHA-256: 8c35fd30645700ab7823fa3c39994c745d840b7fc0d7411fdc7cac45b41b5f2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cmtsport.com/pliki/52558694247.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f07b723d1bf2c0405b398fc6aa86aec6/75695932769.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3b4d6f5433490c3ef876b3151cc06d45/mururosositu.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dd6c52c0a01a57ec8465dea9467b6649/79584692604.pdf
    • http://dinskayarealty.ru/media/file/temof.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6eb4d4a947---sejebimate.pdf
    • http://www.mediagrand.hu//data/editorfile/96935818990.pdf
    • https://virtualpulse.eu/UserFiles/file/29079287629.pdf
    • http://faradbox.pl/files/file/84305874565.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9cd5f0e598---29955450726.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cfc1dc8a75eff65f113332670d466070/fojati.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ffgg5mkddfkkaof75cktu0tcp5/zesatadikelaf.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/c98lmn7jitr6haaslq3aa2otk5/70808675272.pdf
    • http://aklond.com/UploadFilesfile///2021062910114740.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/71639911187.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcd481d12---11280729939.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e9c9e25ef93284cc9985d22e7a691e30/47915226787.pdf
    • http://dlikefulproductions.com/clients/875850/File/24302695975.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1177aebf473879571ceb4d7268360281/75838763469.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762d5949a04---94400210555.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7g6o9ag6jo1f4i9fohr722q1a6/jovopopedigilisu.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6be3231f1f6e39c31993fe287d9c5426/konufipuvikuwat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=print+to+pdf+not+showing+up+windows+7
    • 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_off00010001.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 16792 bytes
font_01_sfnt_off00011813.bin
897f1befcfd34ebaa44b9ca9dc5e9a35dc5711e0414aef54dc487bf39fc0c811
pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 17724 bytes
font_02_sfnt_off000146f5.bin
e55f4d71c73f262cf7f09d5ddfc5f394bccdfcd33564b73b10e4d4abaef3291d
pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 10672 bytes