Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f0f5b6b1bd21b7…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd2ce7c21f4060f3037471c0054a4571 SHA-1: f88096f9c6a95019e9b405613b85d18de682a7e3 SHA-256: 75f0f5b6b1bd21b7ba0929a1fd3dfe7fbc8c8ec8d93efc4cc64354ffa6e51d32
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, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://logistra.fr/ressource/site-image/files/tawivob.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860224715f3---72308805136.pdf
    • http://bociany.sk/media/file/sedilofagirubowazo.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/tvde3hrfrekef3nsik8komoec1/wekel.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/1adacbec520431c08485a7e16016a017/wewupotarutasirepotan.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe3629a896---kikexak.pdf
    • http://4reality.cz/userfiles/files/41940822275.pdf
    • http://say-international.eu/userfiles/file/nabik.pdf
    • https://bleikss.com/userfiles/file/55187638247.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/e2qd2qsk91nt5skji4kjrfqna7/69903071614.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/15377939571.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/37096275587.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc28bd1283---29738585132.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dce19a766---24242819375.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bff06d0bb2f---34233005466.pdf
    • http://imaginove.eu/data/Files/mataf.pdf
    • http://djpress.pl/Image/files/71431630931.pdf
    • https://etonbio.com/newsLetters/images/file/punisarelaxotaludeninaxas.pdf
    • https://nenanhduong.vn/Upload/files/80762446448.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/475cb4ab395f2fd835882d0cf8ad613e/nuxezo.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f85c12e63561c3edeb29224c80f1c023/98199232996.pdf
    • https://cambodiadriverservice.com/userfiles/file/87424919067.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zuzabozukezubixovew.pdf
    • http://aquatrustfina.com/userfiles/file/bilib.pdf
    • http://bbfederico2.net/userfiles/file/62069227335.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=do+not+be+yoked+with+unbelievers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea98.bin
68437b012b0eb37343ff6b0164a804bef67f3f26cdb8ca14a861ad8c09b91241
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 16368 bytes
font_01_sfnt_off000114fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 16792 bytes
font_02_sfnt_off00012d15.bin
bf869e7997e72c53e240499475b903364b8157819cda15d7c6f0aec2fa770ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 10780 bytes