Malicious PDF — malware analysis report

Static analysis result for SHA-256 38191212f814d8bd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 06:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc5d745be155fae2d05c20ed032be7c8 SHA-1: f98225779a201f05887fcd2eed15434db4d16e8d SHA-256: 38191212f814d8bd3a79e14ffd47577fa97fd683360c29aeee3f356ee73f775b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a link farm designed to redirect users. The PDF structure and embedded links indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f287339d3a---43942247439.pdf In PDF document text
    • http://tehla.eu/userfiles/file/73525006998.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wubugenipajujovamazo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/tozefujafapaviwu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/53389795174.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/pogejamipokowibobudubo.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/morevajiduvikoditedede.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/tenumarolemofosedobu.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/zapaweba.pdfIn PDF document text
    • http://cartopack.be/Images/file/rezufedokevawilakoremane.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/tufugironivonisuv.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/15294480694.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/64880302077.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9023adf2a8fad63ffb12465fe5eccec7/gepis.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/sapupu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb2b138d5---98114243424.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/mowodunowapevog.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/gugafozunomuterepisesoz.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/gajesutepaxukosorexi.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/gemuzabenatuzasil.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78052875068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=top+10+game+offlinePDF 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_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 17168 bytes
SHA-256: 37485f06797ec88bd34ab74ab2446f34959879b34b777c44dc5e545d0d2de20a
font_01_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 10472 bytes
SHA-256: ed75eaddc01c013a75ffae97087e752b099624e8824afdf7d7ac77b0f4bfbd58