Malicious PDF — malware analysis report

Static analysis result for SHA-256 36161c7256ac697d…

MALICIOUS

PDF

90.1 KB Created: 2021-09-13 11:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc2b9af527a406fd5b47be14d57afd1b SHA-1: be83269ccd24994b7d5e6ce228a31d0ead6a9922 SHA-256: 36161c7256ac697d47e2b79157ecee3c01246926d6cc620512b4cfe374a3b0c3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and other potentially malicious sites. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://icoachyou.biz/images/ckeditor/files/16273999919.pdf In PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/76f8e69554f38634d1b58ec7052b1c7d/jologebi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/871e2ea0a937d6caf46c603f3a7caedc/23486346939.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6133edec7dc08.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/64015791161.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/zanaludobipedo.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/kumerepovatawanino.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/lunufajedavixit.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/gqrnc1f413514m7eq5uvusrf0f/gopavijasu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/fesebab.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/58789250991.pdfIn PDF document text
    • http://p-energo.ru/content/file/bakawisefitasawefejod.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f69e924353---lorelufiwoxesirotol.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/71298085901.pdfIn PDF document text
    • https://profm.hu/files/file/38122595617.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/gamixurus.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/lafegizimavudib.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65626538315.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2bae4631---55410348587.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/90407963118.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/tadakisa.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/sokogivomutuvomaxomewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=s+pen+photo+editorPDF 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_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 18436 bytes
SHA-256: 0f0a4997cf1ecea578d6cccf566c75491311f422b125a4ba450322d48701d86c
font_01_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 10188 bytes
SHA-256: 7e5ff8cf2b107fa7511705fa5e4aa0c5121f24d81666f59f9539f9cb92505547
font_02_sfnt_off000142da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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