Malicious PDF — malware analysis report

Static analysis result for SHA-256 d493963fb8d01686…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 16:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb50a50b5315f040227e74be655ceca1 SHA-1: 1da3f98e27f6ab1645a39ab1963502be6d854337 SHA-256: d493963fb8d01686876cd021ec6a3ad904477f41a2f112debfa9245a7414437a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. These links are likely used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://oniceh.ru/uplcv?utm_term=101+cool+science+experiments+pdf PDF link annotation
    • http://timebank.ru/sites/default/files/photos/pagefile/bexefemeludojeg.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/tegawudurozigedekikugob.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1kg0jl0ilp89op6e6k96a46n6i/65761153864.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/71957129549.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/5875108458.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/sojazikunipegiladelutezut.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/nelapexexoja.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/xejolebazolisa.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518051053_987454426.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/82037462353.pdfIn PDF document text
    • https://izr.fr/files/mufutog.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/gabiponimijupole.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/82351394872.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48bf8a1b1---gomovaz.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/29188238126.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd0d662f9---kerarufapogilizojisoteme.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/81236412422.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/zebev.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/20743178070.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/85158414731.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb016b9b2a81be1385f8a37f3d887fc3/89526022585.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/30882167493.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/sigoxawupaxixaxegugu.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_off00011643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 10800 bytes
SHA-256: 133be2f98e4fe7af29df1c074d698ab0b71a437a21bd3dfa306e6e463cf4a168
font_01_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 17576 bytes
SHA-256: 81d95380be4202b89122c0532c0ff89037cc8f1ba9e24d9e9a4c6447f0213be7
font_02_sfnt_off00015c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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