Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7f57482a35cb58…

MALICIOUS

PDF

170.2 KB Created: 2021-08-07 15:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe9cf5bc9c75100b58cbaa623822f5c4 SHA-1: 7bd9f10f97aa5df2b83e5021991f04f4f041a304 SHA-256: af7f57482a35cb58e3a1b4221d6bdc95464512d6e44cbb4744c4a928faceb6c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

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 http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af6aa7127b1---benudovegukirefok.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/81799033799.pdfIn PDF document text
    • https://flomogroup.com/upload/files/61511462388.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/hf5npf03ob1kt0mgo86387006b/logivobufesojemekerapamaz.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/donepugokuveromizu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f765c242---81136175330.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21cfae8559---pezatufafuwezelaluzita.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4153bc55.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7bc2e693b---38241926886.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6289da9fcaa6e2da731d58ddcc7d90d9/zubokifokuxemenuwuk.pdfIn PDF document text
    • http://liyangah.com/Upload/file/sadinanamimu.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37134574123.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/xototunatufutojigakijer.pdfIn PDF document text
    • https://everestart.com/images/stories/file/monifalijenuretufa.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/7586141934.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f05f52dfc0e4db8243ba45280e0c02a2/towagusotijej.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610011e1678a5---79044723904.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/godubunukovegira.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/voroxofan.pdfIn PDF document text
    • https://cargotavio.ru/files/file/78149226532.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/14482344024.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/89125462569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=srimad+bhagavatam+in+sanskrit+and+english+pdfPDF 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_off0002348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2348A 20960 bytes
SHA-256: 9cc766ebf4f4822d75001b33183691f970005364307ead4fbe150dd0157d13f7
font_01_sfnt_off0002677c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2677C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F93 11200 bytes
SHA-256: 432e869ac7246518bcea2a48b31744355f96a9ad8db66456b2ded3db0254d33b

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