Malicious PDF — malware analysis report

Static analysis result for SHA-256 6366f244cacbef45…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 02:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb0ee4f4fed37dd48ce539fdb58b8413 SHA-1: 6c39e673ea3e2c163808cacf54d15ba5786bc270 SHA-256: 6366f244cacbef45dc2433461b011019f7e6db0397de42e4e5ac432ae2ed2306
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories and disposable hosting domains. This behavior is characteristic of a link farm used to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://mytopics.it/uploads/file/binexin.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/fec785e7f29bae3013ab838c17f03697/motukesubot.pdf
    • http://deltastal.ru/userfiles/file/24733626290.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b350f4ca282b15a9187b5370769e3a9d/17123805914.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609075a776bf5---dobamutopagu.pdf
    • http://bogieclassof67.com/clients/71235/File/norat.pdf
    • http://4bzsoftware.com/Images_upload/files/pabobotebejod.pdf
    • https://cortopolis.ar/userfiles/file/rinamejixagul.pdf
    • http://files.ibiza-ferien.de/file/3401534280.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/luzobuwudegupovez.pdf
    • http://condosworld.com/abisol1/userfiles/files/6003508941.pdf
    • http://africareview.in/userfiles/file/69305637718.pdf
    • http://homenet-spb.ru/userfiles/file/64955627858.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ve60id9g5fcu65hskua7i66qd1/86153685390.pdf
    • http://miraesusan.com/ckupload/files/13119087647.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/26745bcb78665a2a7f2821d1eb487e90/91665634249.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac11813d4---xegovumibavowubidimesa.pdf
    • https://ludifrance.fr/userfiles/file/45509388231.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b79f3205---88655842028.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de833153a37---zuzomotopejuwivofewonup.pdf
    • https://victorybear-info.com/userfiles/files/26099015471.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/9d3453a654c025bd0e12a5b3e7bd1000/vejekupigijaloruxujo.pdf
    • http://aarogyamedico.com/userfiles/file/6980586111.pdf
    • https://datatech-int.com/userfiles/file/99852153370.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/amul73d2iefo5u5dvegei909h5/57346288297.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796a9c0cea3---24497500718.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+type+of+reaction+is+a+neutralization+reaction
    • 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_off0000ed1c.bin
43e8350945afaccdb3a9ddae904a9298c51c6d48e761ce560ff2f33d70a68179
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 10844 bytes
font_01_sfnt_off00010633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
font_02_sfnt_off00011e45.bin
5a2f7475bbac0ba9c741907add13af748acff20c70daca5f62dd92713b096875
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 17260 bytes