Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef56b9c3946cfcc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 21:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5048be3c4053f4a51ecee08663bb0735 SHA-1: fb27e8fe1413b4a575208bab4cc6814eaf763961 SHA-256: 1ef56b9c3946cfcc28ac12ec7ca736b8f83106ae35e75857bb002d9c6dc5a34c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only document with a clickable action trigger, typical of a screenshot lure designed to redirect users to external sites. Multiple heuristics indicate it's part of a link farm hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://yenicekentkaplicasi.com/userfiles/file/ziput.pdf In PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/radiko.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/bebedunijida.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/1233092664.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/vuvanurivujazigifusis.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/mavibuwis.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/2615091872.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/sawetinojogejo.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/rakigelu.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jozusarame.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a3608465---39258958318.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/moxovenavom.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/91149983075.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/16171991238.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/72c029eb7a63544ff899621661ccea9b/12215188340.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/xoposuzu.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/vixuvikuzu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wafisivovesogapapo.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/52377734640.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/rotanokugalizakumafamizev.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/68194849539.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d94d216a5a---bozitafejizanoxamemes.pdfIn PDF document text
    • https://adci.vn/data/upload/file/fevug.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/kivobabogifor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cockpit+bengali+full+movie+watch+online+freePDF 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_off0000af4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4B 11276 bytes
SHA-256: bf309f563e2c8a73dc9e07da7e2df1214beeda4784deb5187f67c85d712bfcba
font_01_sfnt_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 14356 bytes
SHA-256: 30c9631ed718fd83709e5025e07c987ab3a30f420d0d0f6206e611246e196acf

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