Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d2aed07714139c…

MALICIOUS

PDF

108.1 KB Created: 2021-08-03 21:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79fe2d5d7ae0c779f9f0a591c47b6805 SHA-1: 18cc27baa2153f2e8f67807735250e2dd7b79ad4 SHA-256: 63d2aed07714139c25b29e043a70fed1c13146215df23e4c3ee7438b26670bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=what+words+start+with+com PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d714c2b80---35814149668.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gobofifowi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088b0bcef76f---xuneris.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/99021242545.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vifupira.pdfIn PDF document text
    • https://kawanmto.net/contents//files/28919256376.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3bc301a7445d1a045277462b14bea4b6/72397722918.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1a7d6e4352bde82048dfab619f54c9be/50055354026.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/16442233212.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/32299944430.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/94934472413.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609143e04c81c---wokokutezoropeluluvek.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/namim.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdec9321b3---wolebatofojopolo.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/pdudg2srs9f0e118unjottoftq/78175448963.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/dn6iar6epkg58iti1kgc8trqub/69731086510.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c9fec7dacead74261c4bc0c8404a39ba/53404587599.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/78140617280.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/246b2545dc12df4942fffd2085bceb27/faximuditadumevibobaguzod.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/mufok.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070655a99625---7266729919.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210612145917.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608769b91b434---76919337393.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_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 18384 bytes
SHA-256: 8ba74514a3b14ad899372bef5d950645705639257fa445ebb9f8018d1cb73574
font_01_sfnt_off000171e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000189fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FD 10432 bytes
SHA-256: e2c9cc9c53dd832e710f12b214b479de6f54c4b4726d00abf1fa227d59ee2b28

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