Malicious PDF — malware analysis report

Static analysis result for SHA-256 1658d6d9470bd9f2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 13:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2862c852280477eb92837e015d9670a SHA-1: 1aed98523afcc7e70f49a41765981584f0e23b89 SHA-256: 1658d6d9470bd9f24f5ec21a2d73f666e4de7ba03222cdeca3b580cd9aa51b05
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites hosting PDF files. The document's structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1efec51e3f---70826847189.pdf In PDF document text
    • https://coil.hk/upload/files/3473313274.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d127bccf3d---xidok.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/rovez.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/56785975437.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/mozakozox.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/kmsn5iesnsc5bkq89a3rhkijl0/niwisapagagexinuzi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8sced1t69qgvvnvc36l6omd151/xedevetenedasigefopof.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/eee1b8e40353f236d7e57496a38d3465/lewaduvuperavavare.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2668be31---tabasotozunexov.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bebuvaravafobijeg.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f258fc2e---69959676373.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumidorewokiwag.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/baxekikopumejipagiwuzir.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/87159489563.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/rofewijapitazekuwerim.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/95739441221.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b62ce66e6eb---58837111346.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/63097403994.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fkem8npjlqbr4k5t6smn05ff7u/80740293373.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/91871215639.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d80bcf58a657f3bb6e03cedade81c4d5/xidakajudafawanugiko.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf56d64abc---73924290590.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/figidagubokeru.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o2n18rba2o19s0mcm3ptvfjai9/gifaxikipolenegegojej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=qualitative+research+defined+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 16372 bytes
SHA-256: 2f818a13a10e56b23e5f93ffca144e311ed4b8a5c5a5d2205ba2e0e4e5958f9f
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10824 bytes
SHA-256: 3d21620ff8f0ae0c7d7350fd282c41a5c1022711f76484f99afef10f30a18635