Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe003b93de19d4da…

MALICIOUS

PDF

94.2 KB Created: 2021-09-19 07:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f702b83254aedfe6e7b0032d5dbe3ec SHA-1: e32042a87ff16c6d166a1c1b1d6a380e313ca20f SHA-256: fe003b93de19d4dacc277b5f170154bf5720133a34eaea58c6ca2ed85592d076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://archism.ru/uplcv?utm_term=gymnopedie+sheet+music+pdf PDF link annotation
    • http://yetisirkaucuk.com/firma/files/51581068696.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/75616795221.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369a06c9e4b---jakuduwew.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/65748827711.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/jiwakobuti.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/fugerurox.pdfIn PDF document text
    • http://dgjst.com/upfile/file/jawadazigoka.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/barezemaroxoda.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/73742172699.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/penawilamisunojoz.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5119f0e3---koxidisotep.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/94f329985c01f86b4bf5098a5ef36142/39949556027.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/nubupug.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210912052903.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/lolapetovez.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kakedexu.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/16130166821.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345dcc113db---28161486542.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/batir.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/65412318426.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/60125055966.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/79819496872.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1220b9a0---66373618326.pdfIn PDF document text
    • http://wsm.hk/images/files/57350339264.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/12243567531.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wipufabudafawakalo.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 10828 bytes
SHA-256: b3cb8f3496ecb6a1c78c4d7d90763f4488a29a47e6a8708829ba946ecdbb3411
font_01_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 23224 bytes
SHA-256: 58aa2cd7dd3e24f59648dc8280f41f7934d3299faed22aa3f4fc6c9d09d1901f
font_03_sfnt_off00015294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15294 16788 bytes
SHA-256: 61d8301891dd8a41b55ba72cf4cdc13e79a4dcb6c90e3e96fd39d8586e7293ce

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