Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba645011081b907…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 12:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7dc839aebacb7e07146563b35581ed7 SHA-1: ac9434de77ac58184cc844b699b66fff37870671 SHA-256: 3ba645011081b907a036cc182776d598e3c33ce92b480924ce0db908d3a1c3da
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains heuristics indicating it is a link farm and a lure for remote support tools. The document likely attempts to trick users into downloading and installing remote access software under the guise of a free download, which is a common tactic for facilitating further malicious activity or gaining unauthorized access. No scripts were extracted, but the embedded URLs suggest a pattern of hosting malicious payloads on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b65ebe695c9fb982836c0af50648c280/lovufaxus.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a93c9017---35163999100.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610c530baad7e---zuzajusido.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f879b07a07a739d9aaf61681887c1016/fimituratefa.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102d5eba79a0---59879458072.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/894b483c41939bf44564ec659d1e664a/timavexekebazedu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8b7f70d89ce3923633607871219d0d5d/zekumovovi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a03aa5da5---62759732436.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/pixuxavuporeboxemimupeto.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/72618110260.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/kj67p7s2vcc2j5ik5fhklnfdng/57876626949.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/23702928613.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/rekagopalemamebirode.pdfIn PDF document text
    • https://tavio.ru/files/file/lofabasumepiz.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4063dbaa2f33be6aff92da7a50205d7a/73330287054.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/lasilibiz.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/65704139233.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/48291683323.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/80491578951.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/40703006874.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/fanamubarasapufonod.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/96187291556.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/femipobuzexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=coa+pdf+free+downloadPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 19760 bytes
SHA-256: e2dc55be714f86c65ba83549a350f4a9590579a3c09bbaefd1d388a12c7a366b
font_02_sfnt_off00012ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE8 10248 bytes
SHA-256: 2bebdcdaff7ed19e5547c4e155623d4df1dffe9b76407ca15d94f19179854b22

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