Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ad57da19d625c9…

MALICIOUS

PDF

90.0 KB Created: 2021-07-01 15:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09329645ce54c1037e80c534df940da2 SHA-1: ff5acfb0e05cce706bc082d2419be49033a921ad SHA-256: 74ad57da19d625c99244b884eeef868f73669631f4ffce72b191a8b91167ff0d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of external URIs and link farm characteristics suggests an attempt to manipulate search engines or redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714abd5d022---nebobimun.pdf
    • https://vivekanandbawwa.com/userfiles/file/22199992644.pdf
    • http://alfavs.eu/userfiles/file/zopawopafakupivelofaj.pdf
    • http://lasfyy.com/uploadfile/file/20210609015529291.pdf
    • https://yz-yongzhong.com/upfiles/editor/files/fabaroxisuzikepovab.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f1b89af288f8d2ef97f4814b28c060fc/xigufonofo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a73bb613b6c---95949151350.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/00a268aa301e33a866c0b164c336bdd1/jopomi.pdf
    • http://domingo.hu/ckfinder/userfiles/files/zapabemimusuza.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7e837939dda9cd557fe1aaa1c3ad7ae/webisuvuwuwubudazik.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a1166bde---dinatekufolabuga.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2e1bed77b193d8c30e0a4f288d853bf5/11134695909.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79d19b1b4---kerarudebukujejave.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3000e6970e---6899661996.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091183c1781e---pasidogapitolivopogoxej.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/55361538032.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105051347194417.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bms82ame6nsgrqk2h67drjbjlv/xufuduruwokabukaxom.pdf
    • http://4seasonstours.in/userfiles/file/48539237388.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5ea8886be56b2c78360e39e336f1df91/20175149759.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608765b53e58a---67975651070.pdf
    • http://goldcoil.com/uploadfiles/files/pikagisoguwuxomubixajuje.pdf
    • http://animationcoach.com/userfiles/file/62756596371.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/088c3deef24d650965b9ce9d2cdd09e3/muvowupav.pdf
    • http://saluteebenesseresas.it/userfiles/files/rebugevovixorakaxiw.pdf
    • http://podiummoda.ru/userfiles/file/37643920565.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=examples+of+gram+negative
    • 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_off0000f9e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 16792 bytes
font_01_sfnt_off000111fe.bin
77ce8ae088ded9a5b959e795861948b8e4aea86a74de5494627059a3a59ef9b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 10852 bytes
font_02_sfnt_off00012b11.bin
c27f3f4cdea98c2f407c4cdc8e13fa63dd05a801fbc08585b5b5ce9a2de64857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 18336 bytes

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