Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30332f1f3d31993…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 21:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263b631dd7fc447a02bdae4b60e1cebb SHA-1: 3e65ab1019c04eef00a4847bbffc32e425040bf5 SHA-256: e30332f1f3d319934d4706b8ede083005b247915f3681a4a1ae6a2ead3360d64
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as lures to phishing sites or malware downloaders, aligning with a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c6df9ec2d987a7dca5572bfb59ab1386/2294564088.pdf In PDF document text
    • http://darstin.com/userfiles/files/23981448574.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/bukurozawamopibobodunow.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902053618.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/gofalesixuvejenug.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/11515968809.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/521743134.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/15449187437.pdfIn PDF document text
    • http://itena.si/uporabnik/file/71988623917.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/pasefalokamodevevajefarel.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/61253328032.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/8327177312.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/junub.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/22968804648.pdfIn PDF document text
    • http://baoveantam.org/upload/files/wimefugotikugajuxatigam.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9eca7ab---pexerejigugo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133f05a703e4---beror.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/92581573722.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/kuzazopedofefi.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/sedijuzazamixutaxomidux.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/69405971616.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vuwavekutezinadajilirif.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/xofotugivego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=it+happened+in+calcutta+watch+freePDF 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_off0000cf12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 10564 bytes
SHA-256: cf019e0aa1aa2a01a9e81a52c8bd777013d3cc50e773f3026e3becf3ad7a37f6
font_02_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 18456 bytes
SHA-256: 900a0748f4259085d4d921ecea4e71b81020e784de20837369192c88bd679d05