Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e6700de21275dc…

MALICIOUS

PDF

68.6 KB Created: 2021-09-04 17:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e20a34a32a380a021233615d77602ae SHA-1: 4f74a145f4aff9469d1c2dbb714bea724bfec796 SHA-256: 24e6700de21275dc7da5296a15ea205f4fcfedefc47089e0b331c479d60fc291
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded links pointing to various domains, many of which appear to be compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ketchas.ru/uplcv?utm_term=schwarz+lemma+in+complex+analysis+pdf
    • http://decamiones.com/userfiles/file/10503954264.pdf
    • http://zulassungsservice4you.de/bilder/file/buzijaxux.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f56f39ab68---37769829580.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91573fc23---timalop.pdf
    • http://fst-uinsu.net/userfiles/files/83226868134.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/piwapixabowomorugorifip.pdf
    • http://pillshop.ru/uimg/files/8584660192.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e68a284a---muxedob.pdf
    • http://narcisse.sk/editor_uploads/files/xobomizogibudipa.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4867a3ab97ffdbf5525b74909c230fc2/57589668429.pdf
    • http://hakkabrothers.com/userfiles/file///14848491085.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee21aa56a0---27716124853.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/lunavuwevasi.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7bd4ac61---84144644475.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/987278ff9c7dc5432aab499daeb9d586/zotosav.pdf
    • https://hyosungulf.com/uploads/file/6924876874.pdf
    • http://scandirent-new.ru/uploads/assets/file/68744530243.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/724vli98tv906rd9sdrq1ij7b6/2663251862.pdf
    • http://gourmethousemacau.com/UploadFilesfile///tezefubebajakutelag.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160898f6b2aa0f---bekiputiruz.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6abcb3576360955b72dc9c47e69abfc5/83357104520.pdf
    • http://goddesshair.net/upload/users/files/56980330604.pdf
    • 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_off0000aff7.bin
fd11b1554c4e0d781dad672654e315188c168775d54d37d8f6c879878d8fd73c
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 11224 bytes
font_01_sfnt_off0000ca25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA25 16792 bytes
font_02_sfnt_off0000e237.bin
bb94a24e047bd10e01636493e298f5f74cf146e26656086d9aee8ef2acc6569b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 14012 bytes