Malicious PDF — malware analysis report

Static analysis result for SHA-256 d375dc38174cf9c5…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 23:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 854f7919be5652c490b49cd715a8456f SHA-1: abd6ef2c3fdfcc10c2e6a79f92fc17c0c136e6a0 SHA-256: d375dc38174cf9c5f118da93cf2f93ee57e27e851c18d05f8caaee255537f9c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://phamtrangia.com/upload/files/mifikodipinilen.pdf In PDF document text
    • http://studiomanzetti.it/userfiles/files/63458163919.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/57c5b88507cffc394b3145a287361a2c/90789118512.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/68937677419.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dhsqu0ooj21arqveivaml67u20/bumonizibibifo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d86f3463449675e43d6d4a5dbc1fb491/31565156373.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/51e226c6c87cda453c166ff1b6313977/52772027861.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051612052873499.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/filejewuraw.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zajofe.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/33068032741.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2cbd640114eb83a40adec809bfc17cff/xowituz.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gusomubidirake.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/dbe75b907666c2e51e996d3c7febed56/43598900761.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/7925370244.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/11224821423.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/fetoron.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/13634354306.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/73059276214.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/94788306178.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/50774120667.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a5cc3eb349beb3ad95a92168d59fd38c/36217280745.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784590a4381---vupetifapemusofufugapav.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/mitiwi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/katepoz.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/14daf8b94029f79f0071e5fced8874c6/tewisedan.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/mofedojax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=usage+of+present+perfect+tense+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096894280195---81141811907.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_off0000d009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 19504 bytes
SHA-256: 9815fd6ebc2fdf5adce87cd00a38e1963f5ca8720f490a53f42ecc39d1c7abd3
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 10664 bytes
SHA-256: 8b1b64236bf1b42f3e8ab12ec8959e0ebad97d15c0e849b1b9e572c67cdd4053
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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