Malicious PDF — malware analysis report

Static analysis result for SHA-256 990ff0975fd71a2d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 15:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efd4779b41dd8e88a7e30766d28f7f7c SHA-1: a42f1ef0466b5bb9bc94c4b5ee3394e0ebb30ec9 SHA-256: 990ff0975fd71a2d80266ffb1d822680197e85ae30c1d19630b371c2f3d2c63c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/73653f5e75b06733d59d48471f17b4d7/lakavipezuvokemubiwatatox.pdf In PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/69347900229.pdfIn PDF document text
    • http://119pump.net/d/files/zonolibefenun.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160772c2edd6ce---76908446709.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/afceeaa32bfa39fe0b7c98b41de3481e/67095222214.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/53aa07f1dd3ef02ac0c660fa7749fa2a/vakamen.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/33494625077.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/33533360914.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xamenewazapupitalibijezi.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/b948l0qitoblaqgn1612gjtgqn/guzesinozazegemugu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2e669351ccfc61922d3cc75255c3822f/pojuzapose.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/girapuxasimirofe.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/83573777960.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8e5dfcd2701a85aa1c2dbc09a84f3f23/wefefabop.pdfIn PDF document text
    • http://rs-entp.com/upload/file/37463259993.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/273562658.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/39135709546.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b08b570da---74646542621.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc4f83447---vufatotabixigidexobi.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/7601788763.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/vpik4he8av5p1jsr1lptjstj37/durezenetabarimirajubatin.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/bukisobaxefiroxisoxeven.pdfIn PDF document text
    • http://unseretochter.ch/images/file/bazitepazoxekixuvunuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=process+of+being+inducedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 17656 bytes
SHA-256: 1fc5b29d44b1ee15e1f9eb176ed1bcb8f96198e70257c1eae52dd4dd50211723
font_01_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 10584 bytes
SHA-256: cdd67be0f266e4f09314a0e663e56732931a87131acf342d51d785fb042761e4
font_03_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 17196 bytes
SHA-256: e7aebb34add48d10c0b21bd77280974677665372e508f40649e8f7de186f7493

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