Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f571615d2aa31ce…

MALICIOUS

PDF

84.0 KB Created: 2021-08-23 13:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7abc98d202a845284eb29aceac815558 SHA-1: eeb988109a1b131d6fdd1e4847bb85499286570d SHA-256: 1f571615d2aa31ce6ff3d64a2f94c676fbb747de38bbab1a46c80831329f120a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607961fe1d327---88603123754.pdf In PDF document text
    • http://bandenplaats.nl/cmsimages/file/jiporemefajobotiga.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rv8ctrqpotduch2lj61h3j6ca7/29574131051.pdfIn PDF document text
    • https://makenie.com/upload/files/loxubom.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/6ae0d1f3be71d76c10a367362d866cae/22109074220.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609479744e57f---simewefugulit.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/de2a3739b1870392dab7cb34b7a74899/88554649681.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108191122319149.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/72895229891.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/04c725ff970c5b1a975b1997a6455fde/80914777656.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9bf11b2f3c4e9d63acd086cbee9efa3f/24602159083.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/82391459084.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/95455581720.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/6943925303.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/jupekikolifemulogabu.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/12225428823.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mubidunarigizozone.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070613183895.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/46526950835.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/92425877267.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rilafivedosowo.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/vemolorizopepejuzed.pdfIn PDF document text
    • http://greenld.com/userfiles/godupepesifutodok.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee3cdb2c9---parupewojopakapatabiwivaz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba6c167aa---27278904012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=iveco+defence+vehicles+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 17848 bytes
SHA-256: cdea45dc2decbfd60a3f1574fcd057065d383849f64e743ef7b5cb1a6eef33d4
font_02_sfnt_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 10372 bytes
SHA-256: c0e03cd2d876ea31af1bf907f9639df3ac9c7a602449dfd659ea6060d21837eb