Malicious PDF — malware analysis report

Static analysis result for SHA-256 966c7bf44daf8a07…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 01:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a5647820422923a2e6b2044ae5739ea SHA-1: 32fc499521040e5663f5bd54629938747589b9f9 SHA-256: 966c7bf44daf8a07735be0060b2e2e35e18393602dd0fd098b41858016bc0e08
204 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics indicate the PDF contains a link farm and a deceptive download button, with explicit instructions to disable security software, suggesting a phishing or social engineering attack. While no scripts were extracted, the presence of external URLs and the overall detection profile strongly suggest a malicious intent to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=unable+to+parse+package+file+android PDF link annotation
    • https://unicon-msk.ru/data/files/zusibavakefijatubipim.pdfIn PDF document text
    • https://rafautama.com/uploads/file/lurapamoturuginetevukef.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/pokonasenaduwamuram.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/2716981655.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/rumemisanojedigakanuta.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/89856018698.pdfIn PDF document text
    • http://tfforming.ru/d/files/10202116006.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161316632dc633---vedapozuse.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/35666624785.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109080130347299.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/53766867964.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kunizajaxuzejivakadafit.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pokeja.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/20334229501.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d3eeefae169f7ed2c4b98dae0575ea88/vovavugudazef.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/37244327542.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/maluwavipap.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/43035213398.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd83d2b8cdda6d1b5712c4eaa4744e75/95284392655.pdfIn PDF document text
    • http://www.bash.cl/media/file/34546855961.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/21037454506.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109050518046179.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/nulamugumi.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109101051576090.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/89605292893.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/jobogojajezizotudor.pdfIn PDF document text
    • 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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 11032 bytes
SHA-256: 296c4e509258713581109da8e08a0ef56b8cd7bcca0d2b116a1843fdb33935d4
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 17416 bytes
SHA-256: 4acf4555e8522cc9d2b962a2d9ecf4e79625bbae06364cf7ed49187df9cb785f
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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