Malicious PDF — malware analysis report

Static analysis result for SHA-256 41608f8968abe04f…

MALICIOUS

PDF

77.4 KB Created: 2021-07-03 04:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3422e84e95ed08c30b43d4ff8ceffea SHA-1: bee6b3bfc856def6ba979a2cefa0bea170cfb9f2 SHA-256: 41608f8968abe04fae650de0864b14f99bcfb52688baa9a01dd1e472e74f859b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://constantemail.com/userfiles/file/162417795914544334543.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b635c1fa6df85b11f62afa1194d93def/wafiroromo.pdf
    • https://brahmagnanam.org/fck_uploads/file/mawamolo.pdf
    • http://slsnn.ru/content/files/wefukerabi.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717ad9d60d8---38806010481.pdf
    • http://drsuthichai.com/userfiles/files/70482280420.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abdbc036a26---86918319514.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/11422f575fa7a86814c5c51805af2801/92993157644.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/dvo8gqol7oibtffhagolnhov4g/xububij.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/03bbd749df1f858dcc078cf0f16ac239/lafesemubotuferewo.pdf
    • http://gramercy-grand.ru/files/file/95943462598.pdf
    • https://poolpoint.be/uploads/file/xarixuvibelugufujifigov.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/punideliwopomew.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/615e79345abd4df2f6878a6a8c4c3868/rebivogumiruwajodibi.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/70d805f4ab6d8c15be1617bb00064819/75466474885.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/89453657365.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/siiag9odq52q1ro40ov56gcamu/96911737157.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f3613a25---377504827.pdf
    • http://teckim.it/themes/userfiles//files/9836947400.pdf
    • http://classconnbio.com/img-jacson/files/nifakufufomofegiretikike.pdf
    • http://arci-mp.fr/admin/File/kafababujesowig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=foundations+of+indian+political+thought+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_off0000cd3a.bin
3818468ab31bbd958c5db9c59c8c2ead812ac2280c420922cce2632298c13a83
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16484 bytes
font_01_sfnt_off0000f7c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 16792 bytes
font_02_sfnt_off00010fdc.bin
908429d014a324d4d3dcc183dbacf3dc7403784239bbcb574fe75c5e487917cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 10744 bytes