Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1e204666694cc0…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 13:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50d20940cdda98bd1640d6e9adcf4297 SHA-1: 4b2ac6a039823bb56ac0bd03a31c77678fae0cff SHA-256: ad1e204666694cc060f894f665387d3a26fb2a93e0ff6d3d83ddcdc290b437dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves using the PDF as a lure to drive users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=how+to+watch+fox+on+firestick PDF link annotation
    • https://fortworthdental.net/cmsCart/upload/file/vomapulovoluwadiki.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/vaxejuxobowamobewo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323fd7c7218---35054113449.pdfIn PDF document text
    • http://swhos.com/upload/files/mabitadiloranapofidajob.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/27457293847.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/17c443521a2fe67e4ffd76c3137f1930/jedidegu.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/73647642943.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/rovuwuganixetole.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3337eade4---50077259945.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/gibapoziturokopidizutiv.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/90813045947.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b74a97594d10a08edd610e2ba1aa4ffd/12413121756.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/43843823691.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/senirowizulovoveveb.pdfIn PDF document text
    • http://effektfilm.de/files/file/fivukuxolaxar.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/61517664692.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dositog.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kuvuxujixiw.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pimeluxarojuwiliguberem.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/mipimugojureminitit.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/11618161135.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/63231312138.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/60468718c14bf30fd8492b9dbe34bb11/35951287343.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/40850103385.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/39574225918.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bae672011---biputuzaruk.pdfIn PDF document text
    • https://verner.lt/images/files/vetepikikowakebibil.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_off0000be43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 10656 bytes
SHA-256: be8d7dba9fdab6a1b202d771bf5d16f529841eae57ff3791c5d831f78bea9230
font_01_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 16724 bytes
SHA-256: 71ddd3ee1044ea95f4d5a5e8da6aa05dc8c9a65f2c76fa00ebb2f40b845753de

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