Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a306cd5bbfc9d2a…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 15:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c48976723300766ca2295c8c1c2f5640 SHA-1: 14772135a77af4547cb6b2bf940cab944ee6e696 SHA-256: 2a306cd5bbfc9d2ade090a9a04ff52196e336bb6d3df62c93477ed834c05793e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or trojan delivery mechanism. It functions as a link farm, directing users to various compromised WordPress sites and potentially malicious URLs, likely to trick them into downloading further payloads or revealing sensitive information. The presence of a fake CAPTCHA heuristic strongly suggests a social engineering tactic to coerce user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://medvor.ru/uplcv?utm_term=how+to+add+rythm+bot+discord PDF link annotation
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vrfi3lob01l8k6d5nkg8agcg99/66600264353.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/57e5f00168291fe410894a550833d171/33875973178.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/jo55v1upemj7tohqmf4e4phsft/88213673313.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086644d133c1---87664131479.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5abd006980---12524135326.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221adc9884---befutemad.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/29785965420.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e011c65dba24e66b6bec2ee842534b2a/75972341721.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9a0d285a0196d8344f25bd73c4667442/lisevunabixevikitoxixir.pdfIn PDF document text
    • https://corghialberti.it/file/lijapuroxinaze.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/pupejejadil.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8295a57e---49996456607.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2db9c91cdd---pejugikupe.pdfIn PDF document text
    • https://industriameccanica.it/file/xozubofaviwofe.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/likevavijalutagawo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ca77947dcc824bd0d061576ee261467b/77986975874.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c108222d8---xinusituw.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/u44gm0180tj5hjore488sckn9r/37478717604.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/34f577f7c58f24cd998823dd09775f29/fimimewevafarulojupoza.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u2uheoou3an1rvg35r8avfok5d/gubawitirepomudunaxik.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/sebulogegobutezopig.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f388922a42---valupedozuzotizakofusux.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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 10684 bytes
SHA-256: 4b53b7b485380cf9eac9db8b4a4260bb09df15af52a98a1c670c0bd92228046f
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 16820 bytes
SHA-256: 15d38df15da6be787ba515e71652674f957d4246744bb3daafb9494167354d29
font_02_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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