Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913c45f3372fe5a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 22:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a48b87d4492333d5313db8180fce3943 SHA-1: b985fecaa6575b32d4ff0d949b016c61713fdad7 SHA-256: c913c45f3372fe5a98675cb4717456d9c2fdeaf156b27b99b0ab638c5ff06606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=racing+multiplayer+games+android PDF link annotation
    • http://cmtsport.com/pliki/bewisojegofukegotusebuwa.pdfIn PDF document text
    • https://brs.jo/userfiles/files/rojaxofefadinanej.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/b14thkokjehqrbjmf704ar8jc6/zuxexafufalelivinabaxozu.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/2629725662.pdfIn PDF document text
    • http://geoman.cz/data/file/15134765804.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/45097800859.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/81851885202.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/nakofibenulojenivezixepen.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/53518990687.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/93787523867.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35130893110.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dinepilojepozusuv.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67d5cfbc3---77354657593.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/78685443162.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/pekadivonub.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16308340946344.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/togofipaxelawum.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f718125c4e---visamofefelibodomodofimi.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/6262024257.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/budidijovosinosevutul.pdfIn PDF document text
    • https://edusfera.pl/upload/file/bilosukaret.pdfIn PDF document text
    • http://aurora-c.jp/files/files/59835636470.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/sosazonugujilodimul.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/87689558335.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/xarogazawo.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_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F73 11116 bytes
SHA-256: d8b759e882c6995d216004b8cd7147dc6dc5c2740d0446a64d77e001d4845e8e
font_02_sfnt_off00012938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12938 17068 bytes
SHA-256: 0c818c1c7d7147496b6dfa6da26fdabaf5b98e9fd483bdaecae1d0ad213bd05a

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