Malicious PDF — malware analysis report

Static analysis result for SHA-256 050a79251412d34b…

MALICIOUS

PDF

92.3 KB Created: 2021-07-03 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3b273db696159b7e3410b12f6a93afac SHA-1: 152803ea5520a45ec796e77dbf7045997ab17b74 SHA-256: 050a79251412d34bd76ee2bfc78c9fd6f499fc6448fe1f6c4db757a152e859de
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90e9a3310d---rikogamiwedotujuja.pdf In PDF document text
    • http://lamachine.nl/userfiles/file/lixepoxujibom.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1cfl08ihln1aeok46lpb1amret/86231355110.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/10118794789.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8221c111---bojisasederuni.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/49205763458.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/wufuvufesumozel.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nidixifelajepulive.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tanmcsmn70c58go3urnsd9uhi5/49460633218.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/39220237004.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7456d47bc---nidonoganexupiwide.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/4249151185.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c17b27dde79fbec4200e9914f5c70446/jejewudigifuz.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0797d03ad---telubulumifodo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ac5482e---lujazikukuj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b1cd9daf---73542316693.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8mi54sh4a5q62gu8698hf9rj72/59813183670.pdfIn PDF document text
    • http://airfa.it/userfiles/file/zuzotudofefib.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/48599255682.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/59429348481.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9876cc16a1a0d286446f235065cb2bed/83821444927.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a2a399e4---vipuberuxezed.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/26543631516.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/20510493547.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/vowasodujax.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dd35493e---terafogoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=police+exam+questions+and+answersPDF 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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 17820 bytes
SHA-256: 2699cfe35c15ea638edd579f1146cd958eadf89b6495dd5e28e5a605b94c8a4c
font_01_sfnt_off00013237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4E 10964 bytes
SHA-256: 75946cbb5b6fcef92996c7226fc9c6056d43a91318625a8cc202d9b02787e942

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