Malicious PDF — malware analysis report

Static analysis result for SHA-256 8295b644814147e7…

MALICIOUS

PDF

79.2 KB Created: 2021-08-15 11:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb816f73f3d9bc3058f77c4982e0d7a8 SHA-1: 201c9f3a2aba7a4e405328bd141f8be392c48ce2 SHA-256: 8295b644814147e776c93e9d094a10ecee28c89c768b6629dcbde673a45a05c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=why+won%27t+my+auger+turn+on+my+pellet+stove PDF link annotation
    • http://anatolianlgs.com/userfiles/file/51594972640.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nakubopubanob.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/risozunekupos.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/gufowa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b250ad7fd2b---66512477468.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bc8644b0---22453702711.pdfIn PDF document text
    • http://cityfate.com/files/files/81321201502.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/tuwotezarobaduso.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/nalubaligelozaxuxafono.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/gawuzovakijop.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsa30vmp8okc70n19cdnm6tmc6/ledizekekemunimuxibon.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/sarijow.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/68799222423.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/dibala.pdfIn PDF document text
    • http://sushi-belovo.ru/files/68542459496.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6aa1ac02dea0f42aaac3dfb8f3c013c6/vusozuputo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7itc3iaoeb0bne0b3k99daev7/41766137169.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf41b617c7---28112926160.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/1gnrlk25nloch7qh3nevkd2cbl/majobetijugoguzexuradodok.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ce2f3eff---55657703027.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210713_042610.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/8650888664.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_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 11000 bytes
SHA-256: bc66cdb05c857e020544fd460ee514ecb305e9f1cbfd49b4ab00cd7410e08213
font_01_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 17372 bytes
SHA-256: a26b077d31a513d11f89fe1815afb495d1aaa2e2fd3c54138ccce649bdfd038d
font_02_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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