Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7898de7310575b7…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 11:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3deabca9ffcb637fc77566f27d760ba8 SHA-1: f8de27f188f2091d2479ccb6ac2ad28ec083563d SHA-256: a7898de7310575b7df2ec7aca56f787d96d459d468475dc27a688629e49c7a14
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its structure, containing minimal text and a single image, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it's a link farm hosted on compromised or disposable domains, aiming to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of numerous external links suggests an intent to exploit user interaction for malicious purposes, likely leading to credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 68 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 http://deltools.com/userfiles/file/wekazorawejagenasaxoga.pdf In PDF document text
    • http://farmaciacogliate.it/userfiles/files/resar.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/wizunime.pdfIn PDF document text
    • http://orenprom.com/img/account/file/libel.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/56894172320.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/misuwatogogugatukiloxux.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/8598456331.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614f53f2b0967---vapumuketowosojif.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/zobimu.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/badiwarirofubesekudapitut.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/55499209130.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/barinuvixosepemo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1c7cc1a7---muminozuladomug.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/59787901400.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/genowoj.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/83366173713.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161495dc212682---bewixabigijafujodefori.pdfIn PDF document text
    • https://mauspro.net/upload/files/9622675891.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/14527545118.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/99515408920.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/bosefubevudiwovugutipo.pdfIn PDF document text
    • http://skomi.ru/img/files/file/jevujuduw.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/naworexafujejinuzizeje.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/84845621209.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/32062504517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=social+media+regulation+pros+and+consPDF 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 13848 bytes
SHA-256: d5afb39e8bdd0448292890df8010a4d8f0aa8a58c0b5cad66fe27b76df75aaa1
font_01_sfnt_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 11032 bytes
SHA-256: aa139ecb9b7bbe6a62606a28b09d53550aa7c9fa69e6c519fc85d198c66454ee
font_02_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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