Malicious PDF — malware analysis report

Static analysis result for SHA-256 25130f7717a276bd…

MALICIOUS

PDF

95.1 KB Created: 2021-06-28 02:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6492cbd7bc275876f5114ceabd89e2b SHA-1: 28d88a91eae49696cbda062a46d6e8095448a368 SHA-256: 25130f7717a276bd803bd216ef99669f19452c0001a41d282ca1e30e8f39c99b
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The primary purpose seems to be redirecting users through these links, potentially to a phishing or malware distribution site. No scripts were extracted, and the document body was unreadable, limiting further analysis of the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://zulassung4you.de/bilder/file/tewidijelafakefasisuwe.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/af3e7dc25c9b3937e3a215628330972e/34327575815.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e22fedcf2---52206085436.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/xunemebojoparaxim.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/db69459b13ad05cadf61b0d9fbb717e8/13568901931.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fee26663---zigukiwopu.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/tosazosafox.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/28173121414.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f349b4344d---92211528904.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076559062e4d---vepadifixipow.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gadujadisifigaferaj.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160941f2f5ea33---22317593198.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14216e6426---24538660495.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/3d10f2b0e3d09dfa71b15bbaa7f64acf/zoxinekugeze.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fogt32bia7e3l0oo73gl1i5tkc/35774058401.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/34786095525.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919b3a67589---tifodigedulixolerapet.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/feteresodobasa.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rt1tbib7e1jdjkq1u3gkjj7lmj/zuwigewebitofafewutebij.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/40069626904.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1f6f5df40aed0a2ccfd8cb80911e2b8b/gowox.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/68570447352.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/26913705438.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l281hrk9fmo2reh9j7cf9i0qc2/47590405244.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53184991780.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/wipadapoxuwosapaju.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vosarekurazogizili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=andrew+henry+parker+bowlesPDF 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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 19364 bytes
SHA-256: 6e32ed1e64b159bd651af6b7b7c19ae21b289472e5a36f03cda9af9f840dd929
font_02_sfnt_off000140db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DB 10712 bytes
SHA-256: 1232dbd895f99caa1bd40b8dbaa5b7239124cface4655c1ffd4166329810a757
font_03_sfnt_off00015939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15939 16144 bytes
SHA-256: 0c4985d965f2e55b15ea1fa3cb7d6f8fceb75cf058753215875aa2d860fcbbc8