Malicious PDF — malware analysis report

Static analysis result for SHA-256 b423f3cb1f65cf95…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 03:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 512f5bdf27487fcdb9194413144f0e96 SHA-1: a1d52e75b752eaf1f963341776bf4eae89b407ea SHA-256: b423f3cb1f65cf95e95283b8fbd296ff3b3cd9e8d2f64993e0e7f3fc3072f075
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.jobsincrete.gr/images/_user_na/file/23061610825.pdf
    • http://lexus-custom.com/js/upload/files/69004613638.pdf
    • http://aklond.com/UploadFilesfile///2021061107542084.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608348a01b9bc---36371926665.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0p1pkfthtno5ns623cbjsgvbnj/fenotazemug.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6e37b9f45---38693157434.pdf
    • https://classykitchen.pl/web/uploads/files/tokikifiw.pdf
    • https://advantagelic.com/singhania/downloads/file/torotuv.pdf
    • http://iaestedresden.de/userfiles/file/72106840284.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ce6f9292672ba8700969cbc502f551b3/51864497700.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/klocskv5q0gec4qvk4pkrqju0i/jugalixajakemoselikunuzu.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c009d05cc---48859501833.pdf
    • https://termoformat.md/img/files/10259805648.pdf
    • http://yildizteknikelektrik.net/resimler/files/fuwivujegusevugixubo.pdf
    • http://dlevitin.ru/fck_editor_files/files/piruxoziwazuk.pdf
    • https://myparrotfood.com/user_files/files/71741918244.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/80f380d69585cb816c01b1a7943fb9e4/93306298950.pdf
    • https://cplastik.cz/data/cms/file/18307357171.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/b9df4e91bc03963040236ed55d135921/79833225649.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ffrdkltcrm12iik0b14pab69cq/27658464926.pdf
    • http://wamer.org/userfiles/file/31891749849.pdf
    • https://atcotourismtravel.com/userfiles/file/rekike.pdf
    • https://zivotzaokny.eu/res/file/wumunivanegikawovusaxiwi.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/dv2tbvq70q4aj001gks6kd4e74/6674896255.pdf
    • http://benevolo.it/userfiles/files/zekobutopanime.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=live+life+to+the+fullest+meaning
    • 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_off0001061c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 16792 bytes
font_01_sfnt_off00011e33.bin
ebaaad96fdb0507a30b42a43dee8cb45ce8fb2df42f4566127c3d1e69c15e03e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10684 bytes
font_02_sfnt_off0001368b.bin
c7f18e73222ebaf726de77269771c894780f769d445204e9980afd4c3079f25e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 17756 bytes