Malicious PDF — malware analysis report

Static analysis result for SHA-256 19143465e6a5055e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 11:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fda74e97eb743b87aad23d4e77e0e97b SHA-1: 9601de0f67d7149b3969528a13b2cb1c9c75d00c SHA-256: 19143465e6a5055e31b6c2f24fba90180bb951672e72efbb550eacc9a4507ccf
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential harvesting or malware delivery. Numerous URLs are present, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall pattern points to a social engineering attack leveraging external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=how+to+run+pc+software+on+android PDF link annotation
    • https://riolospettacoli.it/filesUploads/file/xototawaponewitale.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/puleje.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/99ba459ff7ba76c2711880fc0e7292f1/zuzezowo.pdfIn PDF document text
    • http://ailizia.com/userfiles/19683266649.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/8i2phf2rte5lvlq9r516r3cpi4/penezawuxanikosorobisut.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/31334026510.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614791959266a---96985516450.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/momubidagevepaz.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/68801127725.pdfIn PDF document text
    • http://otczenacts.com/media/files/mukine.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/magugajapoj.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/debena.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zakebawam.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/wepexol.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zusekiweralegofemen.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/xuvupamigosesirera.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/javagusexat.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/xiteti.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe359fd28---9091005625.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/jisiduvuxadare.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145f70966ed7---pedapavitatape.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_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 10744 bytes
SHA-256: a205d4b8964fc66949eeeed015943cdd45469e15d8458e3f24ba38e2f97ca550
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 17472 bytes
SHA-256: f0f5b145598359d7a2c56fe3725270eed4986624205047686f269f019254eec9
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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