Malicious PDF — malware analysis report

Static analysis result for SHA-256 23123b2b4a6ec29e…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 17:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f56c4f7bf54c9c387d98215da8056f3 SHA-1: e84ef84365b7ec27ded5521f7553b0a34af20f7e SHA-256: 23123b2b4a6ec29eb7f5bb770d9027a323557a9963dd5d083fe7a7dc024dc661
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of a 'download' button lure further supports this malicious intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=hack+for+choices+stories+you+play
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/73266574846.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bb598f0f897---kikazi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0q3s016p0sg5mfpi59rqoa2mmf/65206596959.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/9278p89h9cipcus5hi7osn7r6f/vefitelejubose.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ac9b985f82382e22bbd70aa341375643/zebidivafuvefuxisu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4ie8qehmotc21hv8ktcctm67q7/66836188245.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f471cc6cf92310aa5b27b9e3982f53d0/timopubap.pdf
    • https://arrayamed.com/userfiles/file/78232034938.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd84fe9941---1930091272.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1890944480---bogisodutodolulaf.pdf
    • http://lucann.com/Upload/file/66326109633.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/973c54daedd79053e0ea116f55fd6c26/34401384223.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b71804c13eb3756fdf85d48b747fba6/waduzinuxejimizusuw.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/losmnu2emo2fonnlisu9idkfc5/xetidugitexezime.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/66973da523d3ac5a7d045eb86a87c4b4/moxekorimizuxufaxapeg.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5f05d5830e80c459e6aa5ef91edb92a9/mupebisidixalopazuj.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160703e89472cb---36028529052.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad3aeadb66---nimuvar.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kb363f3tqldml31gte8s6t9ig3/28078057809.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/57751448376.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_off0000f573.bin
70d411bf87a619a1f3ae448f7e49ffbf39bec62b8797c5da5164d795d62b3a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 17520 bytes
font_01_sfnt_off00012396.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 16792 bytes
font_02_sfnt_off00013bad.bin
832ceae92694cf76969bdc3a3759430b29b4b0ad5527fb04569f151f9bfd104c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAD 10772 bytes

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