Malicious PDF — malware analysis report

Static analysis result for SHA-256 286c6a4c7036b3ec…

MALICIOUS

PDF

95.9 KB Created: 2021-09-04 04:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cd539fe3b9687b575b9b96beb800c98 SHA-1: ee423cf816ebdbe78c3d40781b509d6a40fa5903 SHA-256: 286c6a4c7036b3ec26e564721178f5c1619002e3e35a239308ee61cd8d55962a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress uploads and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://netiko.ge/img/Data/file/40499147260.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mane8ajhmnhp6gtrigmnftb0f2/15870756485.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/39f089a2f419b823746a5496346158b8/30650597418.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/feveninodutake.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/jafajizeteze.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/22665859991.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/79251177918.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b66633e57---23908410669.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zerodupumuradogovamelu.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/3399576645.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/47249752411.pdfIn PDF document text
    • https://armenia4d.com/contents//files/90755734988.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd2bc9c6c7---33459768773.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c3d9c386---lifisik.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hn8h3il5d27k8ediju1glihpc4/kunisasavodujamojuduw.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/61690924245.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/9568544ajupilca27fjru12317/72701115059.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cjl4i7p7rjkm2lkudblaa6akh4/19660869996.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/vumovakoxazu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/dutizoxedawuruxisenut.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83cca10077---tupasiros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=manual+usuario+suunto+spartan+trainer+wrist+hrPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/88b99f65310dc5c127785ca86844655e/jeruwodazonakapunoxoni.pdfIn PDF document text
    • 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_off0001106d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106D 10528 bytes
SHA-256: 409d14456aff494daa70eb7221f6456cff7e1521d3a76e58d27350e4ce84217d
font_01_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 18432 bytes
SHA-256: 54ffec5437d1d38ec15b3f055392ca44b0ecfc522f3747d33901f76ff6c15f7c
font_02_sfnt_off0001580e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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