Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6fced1a4a381d…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 13:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3c977223a39c8a72b0a8fd8a6c6d6f5 SHA-1: 66328b77b9d4197416046a8cc2ffa73a6839029a SHA-256: 85f6fced1a4a381def4ba34b9367681783dd14da29285cca0950043502566b7d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, indicative of a link farm. ClamAV detected this file as a phishing trojan. The heuristic firings suggest the file is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3688

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://officegate.biz/admin/fck_upload/file/54611739653.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c9736ffe---lufuwipuwakulafe.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/kutixosisomejit.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ad3cb57e---63247267330.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/10214556228.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136da534f3fa---tuseforiwuriguxika.pdfIn PDF document text
    • http://zahradysnapady.cz/soubory/files/majuti.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cec8c282f46814c91d7f6f80bf4b0a96/lerexemigepuxupiguj.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/mibolesuliwir.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/nosexa.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/15560901617.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/jiraxuxagokutuwakabi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3f849382---vimerenekugo.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/92596480841.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ta6739fa5g4g0lobl827bgfu2u/rirowedotizuxariludalexa.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/77707087995.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/5360009768.pdfIn PDF document text
    • http://deforma.it/userfiles/files/tuvikezifal.pdfIn PDF document text
    • https://vleek.com/uploads/files/20347405901.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/vapofitug.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85fd4813a---84946197636.pdfIn PDF document text
    • http://brlairport.com/images/file/18457045471.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/wukelogaruliwulojimebago.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e3db060c---69573168791.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e03d8dd6---tiwutemogezubapelojajeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pythagorean+practice+worksheetPDF link annotation
    • 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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 10900 bytes
SHA-256: bc7a549d22bf94ae426b2308d8c289937ad0b1acd42be7c848790c14a2166f63
font_02_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 15984 bytes
SHA-256: cb1d0f1e69dc54bf6f2857cf92288ab4f8f39a45cb6905503076286b83d910e3

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