Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81687321fb43050…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 07:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7dcf7963aeb249b6ef7a51f98a2e70ca SHA-1: 1937a3e6eeb9695fb6976c2eb9f43594978b711b SHA-256: a81687321fb4305078fea8a4e15c378d5294255cfc433cf0099bb609a539d17e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://angem.fr/userfiles/file/51158511677.pdf In PDF document text
    • http://sunwisechem.com/Uploadfiles/files/fabuwe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/6d1ef6e4b8c0c6aee8a4f1e7db4e1ac4/73079367650.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/rajakilupazumotojud.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c22499445c4---44563904159.pdfIn PDF document text
    • http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/mamakokazak.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/sugexefivemusur.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e903670a---80943909376.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/oon4abiu4e22l5vrbpufm9tjbe/27731997905.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/29598127114.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/48027856610.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d8f7083864d6affbd3dcf6177acb070c/gubugixopu.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/57464262673.pdfIn PDF document text
    • http://skomi.ru/img/files/file/nifutupusimozemapuve.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/634f7b672181fd2e954b6910d5a0d06c/29106686309.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c985baf0---62787379083.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c455778d164649936ab7f6029b4ea608/53288522492.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/73766a8b94cfaf576ae132b10350d213/39729827141.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e03138cd---44872408605.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aqib8hd6ajhkmh5socfp1al5d9/17003995504.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6235f5d8d7---23596833510.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218c346c720---11282821704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=addison+rae+and+dixiePDF 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 18108 bytes
SHA-256: 9fd021795541028934891a1ddedf3ba425d16050c9f7ad4a707a87ace97039d8
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10180 bytes
SHA-256: 8a4de98dc71500bc91c17ac80d70ee457088d2c8d539571f7e57875324cf1dbd
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.