Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cabdb2d4bd0f07…

MALICIOUS

PDF

83.7 KB Created: 2021-07-01 19:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cee2d7c307323d44986a0d1146b45d88 SHA-1: 1dff6e583353dea182b93b27dcf55ba0338ed372 SHA-256: 11cabdb2d4bd0f0761ee4f5a0bcfa32e184e6645cc08ac55c330ea60bd7189cc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary function appearing to be a link farm for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous unknown/malicious URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/acp153g1a811hr9j13mtro020v/gifotomud.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xisisirolefiderugiluw.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/clpajbphr041ld7i2lfgn272pr/98649518138.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/bc61efe2a017ea65d0a63a09bd5b3740/dogivuzovadefeseregipeded.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7db54961a---94026317859.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qfsjkloid8ep4l52l5a3klqthf/53680671710.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16079833337aa1---11502481203.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef6080599---14041206842.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d581406cb0---142402274.pdf
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/temapitija.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/vizufu.pdf
    • http://clubesquilacoma.com/uploads/files/kilazirisefusizazukuz.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/cdd391212841ac4a2b02b231d590aa78/21539724269.pdf
    • http://worldcar.jp/userfiles/files/tivozizomuvimawav.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c8269bcf72d5cbe76e753e5bd4d7394c/bedabajib.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d813813169---mudojewukisovuzore.pdf
    • https://matrainagycsalados.hu/userfiles/file/nowaxutufefukopate.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f345d8c7a2---30018173691.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c985ee89c5---darekedimavonu.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d132ecf0c0---fawitamofi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088457f6d72a---xufuw.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7604c49ad---52840850543.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ec8027b7fba7c502b72b36cfa0fc806d/21608638103.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=thales+mbitr+manual
    • 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_off0000e4f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 16792 bytes
font_01_sfnt_off0000fd0e.bin
a6e847ae3e7bd97b22d179c99e7534441146b8b8cadf043bd7be14b05fadac28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10456 bytes
font_02_sfnt_off0001148a.bin
954d833d8be8c3d749afe0afdc6a28124785ad404311c12a88c1fc2a16caeec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 17240 bytes

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