Malicious PDF — malware analysis report

Static analysis result for SHA-256 7044c3fcd4449b9d…

MALICIOUS

PDF

68.8 KB Created: 2021-06-25 12:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 963978fd75695f197fc03dfee0268c84 SHA-1: 63c19762d799e6f4391c9a48cc085b53defe5c99 SHA-256: 7044c3fcd4449b9d6e4784ddf9645f322cfd286666446088db350000054a45f6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160780d6b66170---52267714997.pdf
    • http://livingkaneohe.com/userimages/47751661921.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/4h8913urfohlcr6i046liu1u1q/vejazobizoludigaxev.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/52d6c8f35b5be74fc1e1d17b52fc4bd6/duxuvujijeludoxiledemedim.pdf
    • http://zxsolar.com/d/files/woxezukutirow.pdf
    • http://lnianemarzenie.pl/userfiles/file/36733801231.pdf
    • https://arerp.kr/data/file///32661931765.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ead7587c---43305896504.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l9joqv7vl7mh89rqq5hfen51k3/ligamilosuxagi.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3108bc4d91---gaxaneb.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/40e951242412d4191f0e523de3496e6b/78427029665.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/537657d4566c97ade185de4814743021/rofopepojemufawixenow.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf8b903c39---gumede.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5b3a4193---ronemaxasadepujeposowin.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6600b763bb---46063274794.pdf
    • https://p87.hu/files/parabafikelomulebug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=play+n64+games+online
    • 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_off0000af8e.bin
4d90577b1d49b1b208b64153b004cb696a766d87c82cfa8de14e048ee28feeea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 15192 bytes
font_01_sfnt_off0000d658.bin
4bbdfe04be684e0be2da2997adafc88a64422d98971b249bc6b04be0d18458c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10612 bytes
font_02_sfnt_off0000eeab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16792 bytes

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