Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1c66997eb56e8…

MALICIOUS

PDF

94.6 KB Created: 2021-09-18 03:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a094da71215c158cae821c5998c250b8 SHA-1: 4d78dfdd7278e0be6d04083414f9f89f5ae54774 SHA-256: d8c1c66997eb56e8536d626c9d4675261c2acbf29e84175a410ef2541e6122d6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=fakira+old+movie PDF link annotation
    • http://daisin1977.com/js/upload/files/fezazikizepinuvodefisexa.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/84455667800.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202198_64950_959.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/032306157626.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/76304929476.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/86609917694.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2867ade4b---nigonuvaz.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_A2C09C01EC5F6C96.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/sowifedaguseviko.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/35989939685.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adb0b065ea---supubojufutalude.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/vitet.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/87874341943.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/suvoxomizege.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/06875e9d5e7b42f91ce6ad568eb2bfc3/450410860.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/pifog.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/79434605561.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/18765989975.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/woxoxawativawelujefoba.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/98260793873.pdfIn macro / runtime command snippet
    • https://navliecky.net/userfiles/file/34612784766.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tanidorejoziduzafopi.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/15413669074.pdfIn PDF document text
    • http://kag.fr/userfiles/file/dupagab.pdfIn PDF document text
    • https://chongtham68.comIn macro / runtime command snippet
    • 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_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 17472 bytes
SHA-256: e56c86f8eaa9484943856d0d12918fc0a987b9a71eb9b31c7fc84483b2ee1b43
font_02_sfnt_off0001564c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564C 10172 bytes
SHA-256: a90b1acb1de60a489d7c6d5393ec2d7f576621cb4418c061aa149db9618d0f19

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