Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3e12ae64722d74…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 11:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d63d3eefe835bfbe7b5a46b17c89d1a SHA-1: 3410e4bd442870b3217018514cf91beedc2f6ac3 SHA-256: 2f3e12ae64722d74dca5f7e613afa40f310667bc5a3ccab8957a013063da36bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 compromised WordPress upload storage and other disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tivatijapan.com/uploads/userfiles/file/43692127947.pdf
    • http://nwatchonline.com/userfiles/file/wukidisibonuw.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/65166638779.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/jobofadamikisigofopalut.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/76e902f9621f5d7199b905ab1cc7a8a5/kiwiwijezitekitelasix.pdf
    • http://uhorder.com/upload/files/vopola.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a81d314fa---87213892541.pdf
    • http://hurtowniagrafit.pl/userfiles/file/19460196462.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/37890916641.pdf
    • http://eg-connect.com/uploads/editorfiles/file///sajuvizopa.pdf
    • http://faptvmedia.com/userfiles/file/xikemananelerabilobelodin.pdf
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_394572FBC3731FC9.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/dawowifu.pdf
    • http://gamax-moto.cz/data/dokumenty/solunamaw.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161497dc0f22dc---wigidosukokupalimal.pdf
    • http://atek-ent.com/upload/file/98072282210.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614012662421d---budeboxupawuziri.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/9949703121.pdf
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/dibuvororalasagakewubab.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/73674945925.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd19805f7---50137483348.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210912_124604.pdf
    • http://vino-charlie.cz/userfiles/file/2575449379.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+reduce+image+file+size+on+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_off0000d869.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 16792 bytes
font_01_sfnt_off0000f07b.bin
ae2248d37b312c37f1fa04a28de23469fe7fdce1e22816df07155e87ef44c67e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07B 16460 bytes
font_02_sfnt_off00011b11.bin
d71c4af6e2ef3769a15eb74e1a8e8c5066712659990272e6df7b4944d0b7ab7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 11056 bytes