Malicious PDF — malware analysis report

Static analysis result for SHA-256 7328094de92e6a4c…

MALICIOUS

PDF

79.2 KB Created: 2021-08-28 14:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3de71c87f3528d3da46a8902a58d20d3 SHA-1: d9514e6aaef04f97fbe1d358bd35a1a781dae058 SHA-256: 7328094de92e6a4c5947e7993a1a5db5affbba919893170e2725d84ff9ff32e4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/97785591367.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/xulopisuze.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b230ac4be---98443804417.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p1pti6hdos7mki55le96jdoh80/49545938859.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a070956ef52---32011033443.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tqckj9q06msd501k1oqkbd58hb/ponevekagi.pdf
    • https://bushregenerators.biz/userfiles/files/galuvelib.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5452282c94---buwujulir.pdf
    • http://lifebeachvilla.com/uploads/image/files/84186421223.pdf
    • http://tofuyatogo.com/uploads/files/burakasosivibufep.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0uf36vuh1j4rs0k4ptnmhcvr80/41824821751.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/kerogekux.pdf
    • https://parfumzone.ro/files/file/wonejojanuv.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981c4ba130---juwovutugeti.pdf
    • https://matharu.ae/userfiles/file/55226493145.pdf
    • https://sanipacific.com/attachment/file/pikate.pdf
    • https://ahreco.com/uploads/news_file/52687341325.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/sixowef.pdf
    • http://acudrved.com/ckfinder/userfiles/files/ralodafutekok.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ure84ejhvdbv2kl3plg63j7rf2/buketudirazesem.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01131822a5---85126503900.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/13e7c5e0504288172002055fbcd19cf6/lowabutokus.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9401b961e---16036343593.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f371b62020---65315750706.pdf
    • http://apsons.eu/files/file/pepejadol.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca31de042---wevun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=camping+at+daniel+boone+national+forest
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73c7503f42---3065065246.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_off0000d30f.bin
4f0f90d39ec5fc7abecc5419fe448f10a7aaf7058f4aec7d40a52f1abb512f14
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 11012 bytes
font_01_sfnt_off0000ec32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 16792 bytes
font_02_sfnt_off00010444.bin
4fa8cd7c706b2c620a433c5b33dd8bff31a1251ac2e1078644171c24d7de0e60
pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16472 bytes