Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f6b5338201b239…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 19:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35b3408390d3b638b77530dd00da1164 SHA-1: 5e2c3f7dc9acfe4b9ad444afca99be9353e83711 SHA-256: 84f6b5338201b2397c090ed812e0db6edf2079365522016cfd1ba7093bfab2b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=cracking+the+toefl+ibt+2019 PDF link annotation
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/24057623035.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/20063779566.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/rutoboxezodoxozolege.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613038cf79d5e---43565398436.pdfIn PDF document text
    • http://newcityhk.com/userfiles/vidomasateka.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/ruritikemalakizoxukelu.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/kixigorezuxoxekijax.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/53780095726.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/tubilexubolenojozofon.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410d69d886b---xapolebub.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/94571930372.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/siwejaninizipome.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/maberokose.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wazejozigutasitujavesuji.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/98754055048.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/40451278259.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/37259110053.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/sizexarogoxaxitotagapewav.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/73714117812.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/xoborowobomomikedaxe.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a60488bacd38d71ba85282dce5c5a42a/63245880392.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f69e68d1a---75067580706.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73d510fbf---35371310618.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 17636 bytes
SHA-256: 251995f12be5721a62e93bce8a4a66ce432fa5138c928ae77392fcab497b4c73
font_02_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 11172 bytes
SHA-256: 9beb1115ca27815f0177917406767c66840ae0c15962be90f0a8ab93d0e6d197
font_03_sfnt_off000125c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C3 16836 bytes
SHA-256: 645820c595d4038498db028c8b5d80835908cfe6b43d33359db03e6d05944cee

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