Malicious PDF — malware analysis report

Static analysis result for SHA-256 564a359515e8358d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 05:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5653226a751cd80660a474462896ed5b SHA-1: e75bb32b8e064b506beb8fc35f97ecce10b70420 SHA-256: 564a359515e8358d61b1779e436a7f1982e7286905a0323a2865abdf716afb77
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to press Win+R or paste a command into a terminal, likely to bypass macro restrictions and execute a malicious payload. The document also functions as a link farm, pointing to numerous PDF files hosted on various domains, suggesting a distribution mechanism for further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://karolinanowak.com/userfiles/file/21091338320.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11a783601---53207420745.pdf
    • http://adas-muko.pl/photo/file/85976358410.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/jibives.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/83132888920.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/31321147014.pdf
    • http://mxm-hosting.nl/img/editor/file/46944477027.pdf
    • http://studiospazioambiente.it/userfiles/files/32836905193.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/97885659655.pdf
    • http://kaithompson.com/userfiles/file/3160415936.pdf
    • http://www.enfersalus.com/ckfinder/userfiles/files/sujenibadevatosez.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/nijuvokonetonamoru.pdf
    • http://hilimall.ae/uploads/files/liwofodesazajibovomumog.pdf
    • http://tgroupsrl.com/userfiles/files/79152782171.pdf
    • http://vaonhaphatphap.com/images/uploads/files/tuvupoxepoxidajuzijedebeg.pdf
    • http://slovbau.sk/test/userfiles/file/61088515457.pdf
    • https://svingenieria.cl/userfiles/file/70015462359.pdf
    • http://czechnews.cz/userfiles/files/51189057836.pdf
    • http://kahsport.cz/userfiles/file/dowun.pdf
    • http://a9188.com/upload_files/art_files/files/20210908_034012.pdf
    • https://nedimgame.com/calisma2/files/uploads/zuxijixuvomenepoda.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142aa5fdb1fd---feradatotukabidonanipofoj.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/323fb8ffbb2570d71548db5051b33637/22795024241.pdf
    • http://ljjxmining.com/uploadfile/file///2021090917114563.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+wifi+hacker+app+for+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb63.bin
5b88a9466765f4e65326cab14a80e908e45cb06ac11707405ac68a80398f2377
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 17708 bytes
font_01_sfnt_off00011910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 16792 bytes
font_02_sfnt_off00013127.bin
bca016cc5177247413ee7d50548f1be4e37ffd42cf32ac7cfa8aeeaf562cd154
pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 10316 bytes