Malicious PDF — malware analysis report

Static analysis result for SHA-256 156c191263fb6679…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 12:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 417bc334dc0c828dcb79575a3a2ca19e SHA-1: fe6b3022bc30713d19fea80f51412f180f90a233 SHA-256: 156c191263fb6679ee0c28b87089939784dd780295902de6387c909f011f1c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://baliretreatcenter.com/olabali_ci/media/images/newsfiles/tarokesiwovo.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/8qfo66aebmd9rbs6tv23hl9jt7/vuzuzowebusupu.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/84b9m69ggtmav3f8nact2mcfp5/ziwatel.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16140147719fb2---bulosapivilewadovamipesi.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/linoguvunur.pdf
    • https://aimhc.com/userfiles/file/70224325171.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614740cacc820---49883223057.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/11249859353.pdf
    • http://castudio.eu/userfiles/files/27463431121.pdf
    • https://wmu24.ru/media/file/mazapibe.pdf
    • http://marketingnews.fr/images/file/96318708919.pdf
    • http://rancholasmonturaspremios.com/campannas/file/28936134458.pdf
    • https://himalayanthailand.com/image/upload/File/93853824556.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/34099651275.pdf
    • http://kursadowicz.pl/Upload/file/moreta.pdf
    • https://xn--fiqa735be48e.com/upload/files/getinevisoxiroxogunivewi.pdf
    • http://bjxbw.cn/userfiles/file/fixumazefapusetugitunig.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/68532425819.pdf
    • https://urology-andrology.com/userfiles/file/rovenutixisurovafine.pdf
    • http://rasciindia.com/firetech/ckupload/files/13504424993.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/zuvuvoxesezesofupanaful.pdf
    • http://karimeh.com/public/userfiles/file/2013549030.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/58621203274.pdf
    • http://mycoapaisyl.com/webimages/files/mituxudisaza.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=triangle+exclamation+point+android
    • 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_off0000b9a1.bin
50cea2d7daafb0de3b036f9c1f27e8732ff95de6290224376f9076d9cfb31abf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A1 15356 bytes
font_01_sfnt_off0000e0a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A1 16792 bytes
font_02_sfnt_off0000f8b8.bin
7c8b0aae9ec289d65b6340080161ae6e9b2831e4a3fcf02b5446ff821618b9f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 10752 bytes