Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bd4df0f18b678d…

MALICIOUS

PDF

94.5 KB Created: 2021-09-06 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df96a55b5c1e0222010b3790d004d4e1 SHA-1: a64fadc871a53c09d1291bb9a013e4695af66ad9 SHA-256: 12bd4df0f18b678de20df2b737527dcac3fd62ffabdfabe4f805ef3995b269cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. Heuristics indicate it functions as a link farm, likely intended to lure users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=crank+and+slotted+lever+mechanism+pdf PDF link annotation
    • http://thanhlapcongtykiengiang.com/upload/ck/files/fusegiderofolano.pdfIn PDF document text
    • http://nature-revive.org/files/file/rebikitovavu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/78a376bd1f035dde181d66e373e6abb1/bixutorekufumiki.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/wemazibejezupomokumetino.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/6443633640.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210705_CDECF5F7F145DBAA.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a1b56752---76913732581.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f004a65c553---lamasabu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/b2btbfkgk7kei0s259uvr438e4/poboxufusugigad.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/65391995995.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/rulodukinarosamoburopa.pdfIn PDF document text
    • http://le383.com/uploads/files/9296502237.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b57f448dd15cb59a88781b9bc67a91c2/jokexilupadofupimutuvipo.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dakajej.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/fexanubizutovoponukanatop.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/47657132845.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/jiritobagupafapejoxi.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0dff3ea5c36e0cbefd860143e3e294ce/36392739672.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613569efca4e0---30692778876.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/40803628277.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100c0c65aaba---64413894478.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/43860109197.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/35442627996.pdfIn PDF document text
    • http://twilaw.com/files/files/19552000656.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 18620 bytes
SHA-256: 780e9efcedd84a50459d14d129f668132a15c174f838fb891af6836dcc1d3dd4
font_02_sfnt_off000152bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BC 11076 bytes
SHA-256: cdc125175e91204f688c33c5787fb7a5efbddcb06491f4f7a2f2f76e7a79f048

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