Malicious PDF — malware analysis report

Static analysis result for SHA-256 4329a0ca3f5a6050…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea6f3822626b76a0b5625c732e16759d SHA-1: 61dca141376da4a5751041dfc4577faaf0f90a7b SHA-256: 4329a0ca3f5a6050718b3ee4fb3d765005b992b12119daa0ebb0ac480f11e0d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics points towards an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wastran.ru/uplcv?utm_term=how+to+change+app+icon+in+android+phone
    • http://evohome.pl/userfiles/file/zigadugozizijoxifuxa.pdf
    • https://proia.bg/userfiles/file/37890370605.pdf
    • https://tsegypt.com/file/49416563402.pdf
    • http://bangtaisay.com/uploads/userfiles/file/tirekajegubawuli.pdf
    • http://dade666.com/userfiles/202109file/2021090414073270554.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vruq4hsnin9ndecslcr8mfc298/87642314824.pdf
    • https://sanaspinler.net/calisma2/files/uploads/82345359060.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8af4acea4---29117676248.pdf
    • http://poltinik.ru/userfiles/file/50685193600.pdf
    • http://myepres.com/HotelEstimator/userfiles/file/kazatifi.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/22724435691.pdf
    • http://aloeverajuice.cz/files/file/murenanedosixezasef.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210901_171016.pdf
    • http://thepnguyentran.com/media/ftp/file/tokoxapadawedumevazejuz.pdf
    • https://taperagi.com/contents/files/sikefukefuf.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d225a763---rarigatudodinutibeworuli.pdf
    • http://files.ibiza-ferien.de/file/15762556689.pdf
    • http://www.globalnautique.nl/upload/files/rajavawenirorajobibixesu.pdf
    • http://ch-bovi.com/upload/files/43763902666.pdf
    • http://quick-thailand.com/images/uploads/file/digajejipimip.pdf
    • https://airxps.com/userfiles/files/patumawefifoxikilibuf.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ded3a495---41436401379.pdf
    • http://rideabikenews.com/user_img/files/mowog.pdf
    • http://isotope3.pm-ural.com/uploads/files/54758302204.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_off0000db39.bin
b447915cf84fd1a72f4f5a37365e6ffb288ca93cf1dcc330b5e5e859c783d0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 10656 bytes
font_01_sfnt_off0000f361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 16792 bytes
font_02_sfnt_off00010b73.bin
78d88406fc92fa7ffdd0560174b904328848a375755fe372328c8aed9e3a5a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 18144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.