Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa6f9fc9c42b53…

MALICIOUS

PDF

87.7 KB Created: 2021-08-07 17:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e9fdcfab2357a8a9276b680283084b9 SHA-1: 35f35a9f12570f7818b2d5321683b8dd4c8f0f32 SHA-256: f5fa6f9fc9c42b530461c72a0b93b2e3efdd46483b89d3967f171b703ca57aad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and the presence of 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=company+of+heroes+cheats+android PDF link annotation
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/88224240594.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9b4f400a63f9880b5c9d699537cf8499/140198630.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4908755b2---xowazovadizekubesib.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/fukotonuzomulogewalo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e323bb3b---23461336046.pdfIn PDF document text
    • http://samtekelektrik.com/files/19969206229.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c993c3f62a---vogotefux.pdfIn PDF document text
    • http://szwygs.com/upload/69765145018.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/xovalitilosifelapigu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a816ca6804ff0cd77b1c8000a361e8cf/zafowolulezodi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0891345f898f050dbf1c1bae4d0b7944/lezozujirididafuvaxatid.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1161273914---94953161986.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/316d35b35bf7b76dc9b5c63cb2eff351/sudedugigiwaronaf.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/78631741898.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/dofufoxudake.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860c6d7b63---lelowizo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/78491661172.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/93376289779.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7079467745.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_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 19532 bytes
SHA-256: 7174c6cfd84c9c6ce637cdc2e038e95cfe0945e6a4618018be12603cee2c565b
font_02_sfnt_off00013759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13759 10984 bytes
SHA-256: fc2470e059d6430ef94261aff22a4f97c077b4fc1babc0da41f4a30a76a250d5

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