Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d57508e3fa813cb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 17:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f831e1f2b08434c1d9c07de471272f9 SHA-1: ed88c66f55afc0db7072fd07ebbce67f6fb1c495 SHA-256: 6d57508e3fa813cb5f6e935bfaf8fe43f2202e001907a15d0054a5c47ebd59d1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains. These links likely serve as a lure to redirect the user to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=letter+of+resignation+template+pdf+free PDF link annotation
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/27545736546.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wuzefipifefobosi.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/gimasikunezan.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/pikazevikitokavagi.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/33804793258.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/jusununutudi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/81711cd06a00bcad6aba406c9a240c4c/lazosepe.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/falujugexuzogifapiwo.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/96803970282.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/d0347da35cf7ccf088eef63582f3822c/66033989265.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d51ec76d---kanuxarepixobomom.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e4e8f062---jerawaguta.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136895553915---99089270202.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/1021298594.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/poderedawakojukiveduxa.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_3609FAC92FCE361D.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/23836421332.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161302c8d1894c---ramevapon.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/4652243275.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/tikosoruxokot.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/50763209809.pdfIn PDF document text
    • http://jucal.es/images/file/mulukafumemalov.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/pajulazura.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_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 18072 bytes
SHA-256: ed7f152afa277b29dab09af39ce5150ee6833ac52dc9d22054c12705a708d075
font_01_sfnt_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 10796 bytes
SHA-256: 2b55389d8b59e95cdb8d19a45955b3ef36a01930de5526dcbcb9ac6f5ab0dbef

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