Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aba7265f5e4172…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 14:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7d0b4ce3e70d8e99c4b7459840110d77 SHA-1: 4dbb27562fbe493fe8671dc811821e787a3abd7b SHA-256: 19aba7265f5e41722b8743595f0afb1e5970b48af457c32d18a9e0e914f4edd6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. These links likely serve as a lure to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/esuvvpkgdbjufgimn2nhfbpffv/30516122337.pdf In PDF document text
    • http://aqs-group.it/userfiles/files/61119085821.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/33869598f23bd3639a3ce06c907c9745/mogutojanesubujemoserepak.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/vesurufulovigukuk.pdfIn PDF document text
    • http://parentini.it/userfiles/files/gupikipevaberijiwevinu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/iie115ect2pup76c4osrv9jgn9/4288210749.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/pibalaneragivubikajep.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/59664187594.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/93919532234.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bcfdnl666gpqpbosbvh2m2l330/zeguduf.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612d23176c757---jupidazabetepagobezuwevo.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/23340698130.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/59801fe5287ff9d95b08b8814eac75c5/garamawuvuwaj.pdfIn PDF document text
    • https://anjingliar.com/contents//files/55964061960.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2d95c40f31e8715f0334fadc9e223620/41582012167.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6b4da57b13f2ce1315d38f20bc1ba8ea/gikujapemexorelaju.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468ecb9f7e---83111053175.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3d21470d---zusixejunesajigorifa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d125e519f76d9eb7845e484325cd877/16231461112.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210809_053434_128.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d6b6058aa92b5d11b4b6a252da7a8a2d/59293356535.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef3d04e85a---9031307232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=7.1+reflexive+verbs+worksheet+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 10868 bytes
SHA-256: b3ab3ec930a3440dd323ae48c60548caa9ac3ae37643cd4d1ac60fb3b9ba69d7
font_02_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 15620 bytes
SHA-256: 54711b82adf0515ac55f73c159c84c86ee5a8dd9ffcfd8df0d47a5a8640432b3

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