Malicious PDF — malware analysis report

Static analysis result for SHA-256 170b7b1955438874…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 02:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9936672799dc431ed4c6b58b63f06ea SHA-1: 76a8b0d3e0d4473dfcb850ec37840bb11d108107 SHA-256: 170b7b1955438874adc66fb7cc65b288cc995df865946b9fbd665adc5b567736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of PDF-specific heuristics suggest it may be used to deliver a malicious payload or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://shen-su.eu/gfx/userfiles/files/21889898211.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5bc5a3d8---89617923803.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/94916780777.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/06i53ihao97r6s0bkp84oq27c6/40060915882.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/ce2053d59efce5df89a04fb8ea373f93/92705863826.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/jipagixawemixusokomam.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0cca3f8754b7b6683a4af23ecd312c02/59511512834.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/22480528893.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/39ad1d547360c967f409c78161084502/nufefukerinaxari.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jhlr8tdbt4gpqjogu15cd0aev5/tadirof.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/losabaz.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/76afc5d0771c7d6eddc1ad3711aa7c1b/funef.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f49a03384---fesakepanevigasa.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/6128772076.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41191074517.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/32049786482.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/1233831299.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/kobesenegutofajanaxewut.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/28435825831.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/sitezoduke.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcdd64b3e---85261772057.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/68604423485.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3a9b64972---fulujowaf.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/08a758c2a343e5a42b434921d891a951/5582651912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solomon+asch+conformity+pdfPDF 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 18188 bytes
SHA-256: 77f9bc681d03fed622a31302008c657938b31b556f8ef3b7f5731fa6be6431c1
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 10944 bytes
SHA-256: 9d777d0981e2641b44446bcb65ccba8c78f9faa3af7f969a316b42c9ee1f2b51