Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fed49ad4a7457f7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-18 07:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e715b236539dcccafd39c69457eac8fe SHA-1: a6f9193cc54aec05c270ffc228bd51a02789ba24 SHA-256: 2fed49ad4a7457f7be07c0a61b9ae7cbf1207d2368a87f48ce91885a735f0f7f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including a high ratio of images to text and embedded links. Heuristics indicate it's an image-only document with an action trigger, typical of a screenshot lure. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 2 text block(s), carries a click-outward action, and is only 67 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://rajakedua.com/contents/files/69265311395.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210902143723.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/nimomoselalefosozapiborov.pdf
    • http://fullx.net/files/97301630828.pdf
    • http://sibinetweek.ru/userfiles/file/24929348816.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631182431.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/50686946434.pdf
    • https://maviet.vn/upload/files/lebedakoganuti.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bad3feb9---50044141689.pdf
    • http://thietbibepnhahang.net/media/files/65293295762.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/ximovusogidenaj.pdf
    • https://ce-mi.pl/uploads/userfiles/files/58872828974.pdf
    • http://slsnn.ru/content/files/foserijawunalifu.pdf
    • https://maychieuvinh.vn/upload/files/benipawedibijirepugobid.pdf
    • http://ruihuitax.com/files/file/xuzezakefijimupepomuvejo.pdf
    • http://herbwaterthailand.com/userfiles/files/71715497717.pdf
    • https://gamepinleri.com/calisma2/files/uploads/63070718134.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/75712503222.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135135e2633b---42112812320.pdf
    • http://hmed.vn/upload/files/80642944935.pdf
    • https://investir-petroleo.pt/ckfinder/userfiles/files/batuxezuvubovuvu.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f47f70d3e---750143773.pdf
    • https://playerpress.com/ckfinder/userfiles/files/47777270975.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=free+keyword+difficulty
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 16792 bytes
font_01_sfnt_off0000c78b.bin
a961937dc19ed325173df03d2c17ee77171e2eb966cd1f76574cb53824221d12
pdf-font-stream PDF embedded font (sfnt) at offset 0xC78B 14264 bytes
font_02_sfnt_off0000eac1.bin
f9bb38497556ea4ce18bca638438e37f655be8aff3faeb4e2784df96eba7f0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 10404 bytes