Malicious PDF — malware analysis report

Static analysis result for SHA-256 d372ca49b89c7f74…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 23:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6e0d92edb7cfaf6762a12e60a8450b4 SHA-1: 5f0b1b6788e2560bd17ba4ad78b657f5d4227f7a SHA-256: d372ca49b89c7f7453ae100e65814e9f7a6f3e3f326794e3781a6fb0d032a3ee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only interface with a clickable action that redirects to external URLs, many of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the PDF structure and URL redirection suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bursac.net/userfiles/file/75987191280.pdf In PDF document text
    • http://studiofelician.com/userfiles/files/favajokawixopifo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416bb90b037---86462043126.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/kagavokupotunoman.pdfIn PDF document text
    • http://artospace.com/pics/file/lulujalapovuz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161484f05d7c7e---muliruzux.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/23254887698.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161373c0126298---makunidudetupupekezuni.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/18346048532.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/28095506526.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/wopavonukogadudapesi.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wulesumipesebop.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/91366524734.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/lezuk.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a7a13706ed1d6e97b1ff7ccbfd9ef52e/lemexazitajuritofukuk.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/73646664773.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/14052469049.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/metilasarepasuvikunopige.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bebudefekudaxufal.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/bopusobiwoxizubu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/790373af2d5ed692fc01a872932077f5/fapeja.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/fulijurovoji.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/lalop.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/38625416406.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/fabazopajuwokifuruvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+power+of+your+subconscious+mind+free+audiobook+downloadPDF link annotation
    • 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_off0000b052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 11284 bytes
SHA-256: 5d26d342d9e629423ffefd8629b683e1ef5818295f51625edea8a38d6200891c
font_01_sfnt_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 14352 bytes
SHA-256: fd92c275102e92de4a5de13d38782c533154461b5a02acfed8e30584efecda2d

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