Malicious PDF — malware analysis report

Static analysis result for SHA-256 1720291e53bb330a…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 17:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9de2da65613badeec6c61913522e6f6d SHA-1: 596fc1724f814ac9603c53f3b872eefc63d43b4f SHA-256: 1720291e53bb330a2e0ed7258b4d95cbc82700b1c4044fc4c5a82b4f5f20bc25
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a click-outward action, typical for directing users to malicious websites. Multiple URLs hosted on compromised CMS uploads and disposable domains were extracted, suggesting a link farm designed to distribute further malicious content or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 69 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://pixomot.ru/uplcv?utm_term=crossy+road+unblocked PDF link annotation
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e7ae069b---nanofoloxuvutumobe.pdfIn PDF document text
    • http://www.520amis.com/upload/files/jifasuxajojirolovitifori.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/vufebixepavat.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jutibumofa.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/pufinusunubisodikenepoba.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/97935733828.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/pulas.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/hvoq36od71epe107pdnj552o5h/bizevowirotoror.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/179a0211e10de2bbf0d701135f97dc4c/62908982442.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/vijonadidixiwudesipil.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/modupejofuzaw.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/40868824968.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/34931597184.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/72950139634.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/22407607391.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132190e74ed3---32865057270.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/24951029122.pdfIn PDF document text
    • https://uudanbury.life/files/file/43696692737.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/wenoj.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/21p79fd0q9of95gqu58utft6af/menuxutesujo.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/9860771412.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/99450787228.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/4cf91f59536f30fc0141a1dbbb8d656c/mewimisudolererexemuji.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/relemosekapidafiminavaze.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/34878387372.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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 14260 bytes
SHA-256: 303b9bbabb2b468c6205ed3be702ed6bdedfc6756e80517953f09bad9d743e57
font_02_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10652 bytes
SHA-256: 31fbf7d92f0545c3f0bd3829437068d345e089f86a626d099f75eac4df4bd653

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