Malicious PDF — malware analysis report

Static analysis result for SHA-256 3297abc119996608…

MALICIOUS

PDF

97.2 KB Created: 2021-09-11 23:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97bf3d642d8ab82c0ae6fbbedfa1776e SHA-1: e3a2cd4d59ffcceae7df4e934542d4bff8b13588 SHA-256: 3297abc1199966085cab938ee958bafbaa43c5dfc889bdd6e2360f513d231c56
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown PDF files on potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

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://mosallaesf.ir/uploads/ck/files/suduzi.pdf In PDF document text
    • http://chalappuram.com/userfiles/file/lajenejuwowugafigaga.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/nemegisagetuzi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf44b1bf6c---ketikotufadimepevavoje.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/62472786318.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/mogutobulevojezunorotuvob.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/ledejafapuje.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/36444443840.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/novepodiripoxukaki.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/zexarodesofazoxiweweg.pdfIn PDF document text
    • http://emannsltd.com/userfiles/70488432106.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/metuka.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656dfcd6ee---19859231990.pdfIn PDF document text
    • https://31app.com/userfiles/file/32897799864.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b814c25619---45024648724.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/tugidoku.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/womemodefosawexojega.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210902193732.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/84487607112.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/11716122679.pdfIn PDF document text
    • http://novafish.it/userfiles/files/kopadadoke.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/87056461656.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/fixokov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+channel+is+pbc+boxing+on+tonightPDF 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_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 19004 bytes
SHA-256: e536ba4e2f3e012825880aa971d555160d6b1f4b17c9933966835192386c4503
font_02_sfnt_off00015e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3F 10788 bytes
SHA-256: 245a113a127b35c80a3ed77b67b1efd7f5d5bb15edb30ef8b6b6fc44dad4ba39

Open this report in the interactive analyzer, or submit your own file for analysis.