Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcedd0f858ad276…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 23:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61a99be9190b7d48bd36abcdbc89e258 SHA-1: 7511e3d6fe2cd2a9b2308571c95c4aa23602c669 SHA-256: 3dcedd0f858ad276e53643aa8d5924ac5d571d11e7d971283cd07b48ca205a61
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a single image, typical of a screenshot lure, designed to trick users into clicking an embedded link. Multiple heuristics indicate this is a link farm hosted on various domains, including compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

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://garglob.ru/uplcv?utm_term=how+to+make+video+lock+screen PDF link annotation
    • http://tucholainfo.pl/userfiles/file/67942523234.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c07bb134f345940e930894003ee9bbd/logawuwitopina.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/75276891607.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/vibezosebamunemerutewus.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/92897536951.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/30fkh8umv0ljakiqs4bl3qii5h/vowujilowidutukijijujaxu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vudilixat.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400447306b1---bazemal.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/rilibonemef.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/pokotibofaruxop.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/fenaduralinobuvemut.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/xasav.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/dorerebezujalo.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/solozuvuxebolirewubameri.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/vobizotivabunogotarefed.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/63730578352.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/60200024349.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/78594871034.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/68708336652.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/tovegofet.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/29978339895.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nipujoselasokuvamutuxosi.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/84983953045.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/dorakifojidufexidifesu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/pivumorosejerekopi.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_off0000b2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 14196 bytes
SHA-256: f6f7bfd802c22188bd676ba1c35bbaeecfe23c441175221f8b1af5207999d2d9
font_01_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10768 bytes
SHA-256: db6de989d48c82fabaf044d2e919eb399bba29e4d81c1ff5f1f52870546c944e