Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edb68908325b7a8…

MALICIOUS

PDF

67.4 KB Created: 2021-09-26 08:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f3667b7de811f6cd35f3c9cd8feb589 SHA-1: 3fdcabff3a85ddbe2dd3f6fef37f853319421eac SHA-256: 8edb68908325b7a854bb893c41b9483a11977eab8d8da1be6c16b81e199281c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or malware delivery. It contains numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=kody+do+gta+vc+android PDF link annotation
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8a9321fdd---75533030917.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/gdejqtt6erlirhk0p8lov6ke1b/nawakega.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea3465f0b---kenatikagez.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/lodizivotomo.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/ponor.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/jowivewelizum.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/3375783613.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/36864920888.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/62040698968.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041428183849.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/47916329729.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/segilosupawifakadegosabi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b496aa1e53---vumakukevominuberolilobat.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kerugiruribe.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/67415454047.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/zejegikopexekipan.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/vasotagixom.pdfIn PDF document text
    • http://aprt1day.ru/file/wetelavewobesavam.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/73949076824.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631721342.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caaabbac95---bipovigofokuzixogigokupo.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_off0000ad78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD78 10372 bytes
SHA-256: 25312aa988dea7373b7afad1e0362236b8a8513cc0e9b266b7e97e3c5dcc4af6
font_01_sfnt_off0000c4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 14232 bytes
SHA-256: d296298aa8e45f723fc2b674aee7fdd8ed18a1eb465263b2cab842491122b96c

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