Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc394f971d258723…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 21:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3e1a4b7cd72aac3b40719fa12a25cb2 SHA-1: fa50162938af6c325496d1bcd693efc1eed00b44 SHA-256: dc394f971d258723435e13ba6a2f2cbe5c1fdf0ab8f6dcbdb3dff4b15a05c8b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. Several of these URLs point to compromised WordPress upload directories, suggesting a pattern of hosting malicious content on legitimate but compromised infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c6493fe8c---32096963805.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b04b3fb42---88882882450.pdf
    • http://bukharageorgia.com/sites/default/files/file/40424874293.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c015f1972b1---87776211347.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n3oib8139fsqjtn94ttfjcfqvv/nozixukeve.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4a88fa17---basezulubeteju.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/wurel.pdf
    • http://stalmont.eu/userfiles/file/74772334208.pdf
    • http://snap-drone.com/userfiles/file/guziz.pdf
    • http://moscow-vernisage.com/files/files/mofak.pdf
    • http://tuanayapim.com/rsm/files/9832505682.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/162e0fd04496f231a6a42d2271d4363d/15654931303.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f10d0a706f0f65bce62c238ce20aea33/filegizikigezegudad.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/74943049720.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f34ddba4373f2b47fd242409ca4407f2/vunabujizeziburasimu.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c645cddc415---90643995341.pdf
    • https://lecapsuledigian.it/file/95811090950.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160801a6845b00---womijimojoguvib.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be94b19515a---75254425026.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ll15kce7keiminoloog9joa91g/5326146720.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3ad0e093---85695571590.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d079877f4845789a3cb1693f823ac3ea/fetarosokunudonerigef.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/be3fe37f5f91e530a3bc31905eb966f0/42645935068.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=name+it+and+claim+it+book+pdf
    • http://perfecturology.cafe24.com/upload/editor/imagefile/46995523903.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_off0000e7d4.bin
89ea2052916b6a3b9d861505b1c5e0e8463a7917d1bf98ab6662e809f11ed14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 16836 bytes
font_01_sfnt_off00011389.bin
db0fcaba3729fffcedb4248b852e5f46bb822e4e4dd8010a9a8b8d228248a509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 10720 bytes
font_02_sfnt_off00012bde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDE 16792 bytes

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