Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43ccb8686fd8baf…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 09:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcf5ce1c0fb520e9d15e595892cbf37d SHA-1: baabae580d83a2d30c36a3d6c3e8b00022868b89 SHA-256: e43ccb8686fd8baf5bba2638c15aa76675922226c3091d8d841b8dc75225a5ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123a2061d1d3---wularebavodebu.pdf In PDF document text
    • https://groupekineconcept.com/userfiles/file/85419695001.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf4ae32a4---36786636158.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/sokexufik.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/jarezujisagudu.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/7212689331.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae1800710---muxutidowugutu.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210727094741.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/18534523179.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8fd4afe5---48149470263.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/340b792336b64c0746cd91a6c04b65b1/kumat.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/55793732925.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb812216---21699250526.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/zipaget.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/87549326797.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/29849017036.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jebopopezux.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262eed6c2cb---vemazutu.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/resuxi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4416e93aa9cb23ba4427cce4a5fee425/jerumefujusulirilarutobo.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/femasu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5b279e22e78e9cb258b2b2db02c2e22e/fikipewalosofiwezaju.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/didadaxew.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3442303571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+arthur+animalPDF 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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 10212 bytes
SHA-256: 890914f799511160c6debc62996009bdff4fce5e30b4844d66f8b758487b462f
font_02_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 15804 bytes
SHA-256: edba67ec97d66fca5a5cdae2b7c1dd349fc825764df0e31135a85dd9750006a0

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