Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c2069384df46a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 12:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54e4da012cd87dca23966007d2ad8c22 SHA-1: 26419635f464507811bd9913093e02c6e1ec5265 SHA-256: c83c2069384df46aa1d354edb956378a4f751cc054080ea68b1e7717e76b69ba
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs suggest the document's primary purpose is to lure users to external malicious 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://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q3v69dimrlp9a6sdjpdjcjcpvd/zasevopejegi.pdf In PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/wubovukusenim.pdfIn PDF document text
    • http://gptools.net/userfiles/file/varujefamugunenofozok.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/tixujomo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/51105900151.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/96186852457.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9235a51d10940ca534ae77bcf72576c3/ladozupipigibekipumok.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/pafowul.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/99320735960.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/dopabilub.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/32840637250.pdfIn PDF document text
    • http://packamate.com/userfiles/bexupebo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f771b7bbf7---sunusevur.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/zuxinugadenelu.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/74497103407.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/70660880833.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/poxuxuralapipapebuvujab.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/fiwisowirejewed.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160736e48662f9---50506364491.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/16951302696.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/54880733221.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubih2f4aa9ges3l8qnh7go1ibl/vujujera.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/6juns68vtbk5psk02l60bveecd/tiwimedibupokonazu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d02e6c11c1---77842271608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transferrina+valores+normales+pdfPDF 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_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10592 bytes
SHA-256: a93a86c2cef8d07ac346b7e3f3748d7b6dd0573aae6bd898a9a589820e9eb7bb
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 20692 bytes
SHA-256: bd1f713edad213b7e058b8f3ecef0411eb83296c2867d82de51805c4f757e0bf
font_02_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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