Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3d1c7b6c9b67d8…

MALICIOUS

PDF

103.5 KB Created: 2021-08-23 11:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e3ee1b78d41f7f6830095ab163b8f75 SHA-1: db849205ee60e425f6385cf64bf170e43728902c SHA-256: af3d1c7b6c9b67d87f40f0b8a801091ad063ed5968feff1b3dea4b6a2b21b2c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fobas.cz/userfiles/file/99341235613.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/670715bd00824b20a639aa4853187a05/gigawiwigozo.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/87512447935.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2829241333---mefopidugajubemejapif.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/nnvgm2cf5fged38bn42d7gu7l4/rikujigiwibaguranowidorur.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab2f01f8a---nupakufulo.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/pugibivagapabinipisut.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/lazogutiwogunixilu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607017d235e56---80250766356.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9918b413---30998430288.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/95100668226.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/waxadixezebusipevoramana.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wutomo.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/64833491039.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/giwamujopewutegekokudebo.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/dadepaduvi.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/nokediludoxinu.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/lalowizi.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/kalimepukomuxazulatav.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d50f40748e2---14852880700.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9d663cb7---37044071798.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea406dbced---kazutidazipupexi.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/xudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=digital+communications+5th+edition+solution+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 10952 bytes
SHA-256: f29055bea9f632f8d7be406920c2a2a71b06e8e5609f2057912129e5a610df13
font_01_sfnt_off000132f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F5 20868 bytes
SHA-256: edec801d3ce61f9517501293d1a3aca230d51aee87a4b804e3ffc8f2dd074bb3
font_02_sfnt_off00016ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACE 2388 bytes
SHA-256: c7b4400ac325ab2f33b7513f90c47e34ab4e3378bb9c2fb955a37cafbe264dc0
font_03_sfnt_off00017625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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