Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc722bb41cfe98a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 10:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e35eefd63659600f0c0feeb2aea89236 SHA-1: 0c2e1d5bfc9dfc250a34fe66b45027d288c70473 SHA-256: 3cc722bb41cfe98a968d77cff2d97b2694b359d50956ba6124e03bae71f79476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URIs and link farm patterns, directing users to potentially malicious websites. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=max+payne+game+for+android PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/bumit.pdfIn PDF document text
    • http://klpa.net/userData/board/file/vegazer.pdfIn PDF document text
    • http://shahgrp.com/uploads/17404937267.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/vuxusasesodudizijol.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210905103255.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e25c9306bf---1613371462.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fulivuvigorafobam.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/icnbjji5fdee50arroqgm93f8i/76746862766.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/43913574298.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a858e216749ef4acb783428a8439feb2/53291490274.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/pifizibivafonelezux.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/79363953116.pdfIn PDF document text
    • https://masihpt2.com/contents/files/60786102069.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404739414d1---10987578294.pdfIn PDF document text
    • http://grimastone.ru/files/44281085802.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/patofepezulapipatareruj.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/vonafijegazuvitas.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/42840724798.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/27083979480.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/dowajimipu.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/karifov.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85b91160a---lotiwi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613020ec89060---dibomijiwuji.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kukavikoziruzireterema.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/kagav.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 17472 bytes
SHA-256: 5cc55394fa0ff629491a070581e6cec2ab470e507574ae59909ac81265429342
font_01_sfnt_off000116fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FE 10740 bytes
SHA-256: c17692d3885f6cb07e464c95fb5049d9ebbf078771b18c0e9a2a3e3fee8fd9bf
font_02_sfnt_off00012f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1