Malicious PDF — malware analysis report

Static analysis result for SHA-256 d359bdfa79889bae…

MALICIOUS

PDF

102.9 KB Created: 2021-09-06 23:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 681fed6c212a37d2e7290a4132cc69ed SHA-1: 4d29c4c16475a353b7d29f53e03200b0cecd2388 SHA-256: d359bdfa79889bae9a3567f753a2c3ad3ef9479cde2daef487954e7bc7ad26b4
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The presence of an 'enable content' lure suggests it is designed to trick users into enabling macros or active content, a common tactic for delivering secondary payloads. Numerous embedded URLs point to compromised websites and link farms, indicating a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://laborke.ru/uplcv?utm_term=simplifying+algebraic+fractions+tes+worksheet PDF link annotation
    • https://boyanbolyarski.com/userfiles/file/wotonatatejitofovitururas.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/tevobotusajukoj.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3b04fd1170de87823b179fd57613ab5e/vegopuzaxegajalobul.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/pukedojawejisebite.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aee4a9882fd53c0010038b66e55f1cce/67641094800.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/14978895325.pdfIn PDF document text
    • https://proxus.nl/file/73861724602.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/59b20b729c3e9c2265280707c237af6c/47374708230.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/40704054996.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/fajajakupapiwijikeze.pdfIn PDF document text
    • http://gojjang.com/uploads/files/rosib.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/32692134806.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g7vgtj0128n2l5t2a5lmni5g1b/voforufudeluri.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b86a95064d89eccb9112f11fa482cdb0/lubitak.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4be5a8bf---zuwimizaponutagovegu.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/jepugiwebolinoboxojedof.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/zazuvamelewoxovubozu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wafipiv.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098410616bc2---72578984359.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/85680272156.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/dogosijudozokusuvizoba.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48a1ff30d1---dupune.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/beriwilonufifiribolux.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_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14340 18304 bytes
SHA-256: b14cd7f4587aa73e61c904c1309456a76fa30a72d0642233a30d1fe1ec3981d6
font_02_sfnt_off000172b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B8 11436 bytes
SHA-256: fb07210661fca14d736564fb7772715faa8d8badd5785d9f4cb96910abef1ecd

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