Malicious PDF — malware analysis report

Static analysis result for SHA-256 879264c3e15e3656…

MALICIOUS

PDF

94.2 KB Created: 2021-06-25 23:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 943a15d9332e8cb5aa978c7731ee3397 SHA-1: 426681502a02d3e3b8f10a924da26cf716aa1a37 SHA-256: 879264c3e15e36562a190916ac06c9564953209d757ef7e12695a58237195d20
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcb8a4394---63382817112.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a02e2b6---86743224852.pdf
    • http://normel.org/files/upload/file/18018778920.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5cea72233---88957491487.pdf
    • http://brenno-tojestto.pl/userfiles/file/3084631265.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092594d0e8d1---vavulova.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vcubfl56295l5mn7k2vi0psc04/96381632609.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/70843005813.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/51407204034.pdf
    • http://espacioschillout.es/images/admin/file/29089165139.pdf
    • http://karat-dobremiasto.pl/userfiles/file/ruvuza.pdf
    • https://artasedanasingaraja.com/uploadfck/file/61329161935.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160811635b6ae3---zapadafe.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/ea95247d41bb09b041b2f6a204496ea5/10381131349.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19cfdaa373---49931624105.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb8ecbfc7---deludixuzogidopopoziselip.pdf
    • http://ottotech.center/userfiles/file/55056909676.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e2067b8f6ba66f64aa79c60bfc79da86/lakejivowexuzuwud.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/edf25cb96b672684771091ec2bb4658a/nazofafufiwizoxijesazas.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/lv4l8jk1dvc6nbghba8m53nveq/regoniniwokiwu.pdf
    • https://ringid.vn/ckfinder/userfiles/files/19387873878.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a085069910---wupas.pdf
    • http://studiotecnicomartani.eu/userfiles/files/22403468605.pdf
    • https://dm288.com/slicice/file/42557342669.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aortic+dissection+complications
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f808.bin
8cbf358a1a50f2a8038ef0a2d14e2d232e25817c8935cbdde38a19e3f016d8b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 17324 bytes
font_01_sfnt_off000124c2.bin
5fe250aed078d0ee0c8a6eeae28bcf3660a94536c0a26c91209d7ae7f0165d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 16180 bytes
font_02_sfnt_off00013a38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 16792 bytes
font_03_sfnt_off0001524f.bin
75138f5539917e0d58d73468402526f7e6f065c00a0f4db9727f61dcf63d6beb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 10656 bytes