Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1c7485b0faaae2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 07:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6e92475a90cb9195425f6d247807270 SHA-1: 7788a2dfa7b6079ddd6029716f07b7db99a30cf0 SHA-256: aa1c7485b0faaae20c02a3414b4acd40cd55dfe7ffa869264cfc4fd0632342fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://toptoptraining.ru/img/upload/file/wotogupomikevovejijez.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4860f26f---3383201093.pdf
    • http://haiphongcontest.com/images/files/81443715349.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f09af2b275f---xopaza.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c594172de59---zumadiwera.pdf
    • http://www.findvoters.com/userfiles/file/43140245482.pdf
    • https://virtualpulse.eu/UserFiles/file/74250789264.pdf
    • http://kvbm.org/pds/userfiles/files/75210475760.pdf
    • http://kavtas.com/images_upload/files/sejuwadafa.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/u5gd7kkgjepfjlbckit1nepkbi/wovolererimurukonuwajole.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e171872f---52271373105.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4702da4b---renefagej.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092475443afe---98046004694.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b4r6dcdap7n1ss73tl4pjmrdj0/nelisawavonopen.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/kegivimejutuladizurovujed.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/97580841632.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab951c4989---nolokop.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607683e15d121---bofitu.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/a3f1132cdf8754342f5ac6880ce79720/42581789773.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/79c550fdcbd1dffc4f0e89a0d4c075b2/guduv.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9410785253947dcf8a910deb6ad8d7dd/72257971048.pdf
    • http://oikoscoccatoarchitettura.com/userfiles/files/nudeduvuveza.pdf
    • http://darec.sk/files/files/86676500116.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610cad3d5dca9---39027586490.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=raya+and+the+last+dragon+free+movie+online
    • 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_off0000ea2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
font_01_sfnt_off00010246.bin
eb08d9008d1539fade561790e2d6b16384fd0c92ca892c79fca48742a5b9f205
pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 11024 bytes
font_02_sfnt_off00011b8c.bin
3509858a432c561d2fb7bfcd91881076e5531da8f5b05e65706003c8a9685eea
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 17500 bytes