Malicious PDF — malware analysis report

Static analysis result for SHA-256 57884b7c62cb3bc5…

MALICIOUS

PDF

114.9 KB Created: 2021-07-16 21:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 36ca888301db71faea5a3fa2fdb82d38 SHA-1: 3969a887af0a6a2c853e60e712d3bc8c8e6380f2 SHA-256: 57884b7c62cb3bc58d1e97d2e3a86221258b2ff9334183f18a34dca67a7e2ff1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing form plugins for file uploads. These links are structured as a link farm, likely intended to direct users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e808927426---noladolelolazuzolezef.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/krjjkve6if4g1qhbnbb1d1s8s2/26662127528.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/7k74n9remo9e0c52qg02jm5d26/sujotomitowivebosif.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f7e7afef8---78809442957.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/mq41tbfc93qec49vg27csv5rrs/84810915411.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jazoni.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e1c8e0f16a08ef428fbd02a6fe166548/66361587591.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b9ecf51d---lagoladiwajevopuv.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c8dcbbad---66625343993.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7b33ecb1---sadatipanutumovon.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160776a0f7605a---lelexewu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/14ce23bcb2f734cfac9b6b99ffe755ca/dutizanubanojeruke.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13a7096c67---37240346498.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e53015dbd2c25182b50944f0dda331e7/muwasakifolunatakegejivu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5567b218---nawusodakupofozogibinokor.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/66306732981.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/2541116055a4a15f4e5cf425a30fc8a8/lufin.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/dovudorunilobobulabi.pdfIn PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c8f9744ce327690226ff28298b8907ac/36939282823.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/11933363494.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8d3980b6fdae997fbd10f964159ff53b/kavedolajoleboganuxabux.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/bbpmfn9biif38tnchqn3s17rut/vuwofedob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=daniel+4+commentary+spurgeonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C5 17312 bytes
SHA-256: 91bf24138d9f4eec565301bf16532c1c5bd8f5c8ea7f0ef0cfd63f936792386d
font_01_sfnt_off00018db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB7 11008 bytes
SHA-256: 4d8aaafc9ac9d45da394e433ffa586247e8f3abcb39ba97c17a09131f5ed25c5
font_02_sfnt_off0001a765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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