Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e6b75cf200c369…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 11:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7f94281c904d54705b45987326e07f5 SHA-1: 0123d7847ce5103f6739fd46c04a6b7cf760636e SHA-256: 93e6b75cf200c3698743cfd2237592fb013efe01f43c9ed64b7660bc457a9f69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not a legitimate document but rather a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/47o85acjnnl3rhcph9002tv73r/tajuzadixesibupiwi.pdf In PDF document text
    • http://microcement.ua/userfiles/file/jewojinere.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/jelik.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/90437818732.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/96083918272.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1faa9da6---83488161730.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/zadoluzakajamekofol.pdfIn PDF document text
    • http://merwepizza.com/upload/file/rujivogagibejesolumukig.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093be859ca11---zofej.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb983fa14c8---kabilemido.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/76372620902.pdfIn PDF document text
    • https://businesslife.com/content/file/rejiwa.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba654c2f7---51338236622.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/turugitibejogunas.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/wadupagiwasiruxofise.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/bajuvi.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/wozinokazi.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/84384064593.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25585659210.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/13226177417.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16075c167f1874---fesuga.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/61735300833.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/puzixogoxa.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/4129102034.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/71bf5c187817cbec8f6202c31a8f8124/2716159027.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c07a873b897596a217b63159b1fff11e/luwumetusupekijufef.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/malafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=havells+light+price+list+2019+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_off0000c46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 11192 bytes
SHA-256: 4e541bad8461ae15ccf2ffd111fc0405cc5287dc53d189adc8b73a0b68933536
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 17076 bytes
SHA-256: c16698adfb13be72fee01eeef6841692f718e3dd0c651ab3f2802cb52e4b5cbb

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