Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa10f5c63755488c…

MALICIOUS

PDF

85.0 KB Created: 2021-08-04 19:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c5c61a4d1a38403edf010592d9703bc1 SHA-1: aa911429ba79b4717125a42c573587834f74685a SHA-256: fa10f5c63755488c95d72597517213d203d2f3902cc7717dbfa5bced940a1d3f
196 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. The 'SE_CLICKFIX' heuristic indicates it's a social engineering attack designed to trick users into running commands, likely to download and execute a secondary payload. Multiple URLs pointing to compromised CMS upload directories and disposable hosting were extracted, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161001b581e427---17075433982.pdf In PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/48363515226.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b44207d80---61083783312.pdfIn PDF document text
    • http://flexa.cz/docs/file/47637666423.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/papexupojesotiraraveses.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d3965d9c---91088736452.pdfIn PDF document text
    • http://rentaruedas.com/files/others/rotefafe.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jre4clemp98jefjpouq4lvr8a0/75042561760.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3c02f7a5cb3b2abd192ed018d3a036ef/76086666376.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664cd9508b---vonil.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jijoxebixibodepig.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e362e40d8fb---josejoforadelomopibo.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/38d25676312d50dfb2e6b5a7fdeab4f3/kewigogubawadenedetet.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/garokarotaxatenag.pdfIn PDF document text
    • https://o-dance.com/upload/files/13320397703.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db5be37e6---pebaririfun.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c28a8eb54---98548927647.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/zitepesijupose.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pafabiwazupuja.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/xukapefaxizubifiw.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65656981863.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/gudavisagofajepoxuronemom.pdfIn PDF document text
    • http://e-sportis.com/images/upload/nizobodufidozawifil.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425f5046b6---visujapanarut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hp+deskjet+f4580+won%27t+connect+wirelesslyPDF 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 19368 bytes
SHA-256: 401795417faafef8cdde3e3c6c868d6cfdc91ba4e5882c0a8361ada0b5268737
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 11440 bytes
SHA-256: a6235a53dcecfaba8bf1b3f5ef92276e04a189d55834ce13a3bc3c72c6392e3c

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