Malicious PDF — malware analysis report

Static analysis result for SHA-256 455abd894ae16427…

MALICIOUS

PDF

97.6 KB Created: 2021-08-21 08:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: d0b50dc71cd08ce6f0f64dbb9eeb4e0d SHA-1: f759717afa79f63e66dce9d150a1c9a54f0330e0 SHA-256: 455abd894ae1642723f689596063ca625a5085b98e8ce98b1cbe6b5c12e15868
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=tech+guns+mod+mcpe PDF link annotation
    • http://cornucopiafrederick.com/uploads/files/79280324208.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/dizukefuk.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lirepaselanit.pdfIn PDF document text
    • http://imi.vc/upload/files/3345285514.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f7nv0pjej9q4e6bhhjd32t5a03/91014580784.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xebewonivodotuf.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/jev2a76l8fme5j31bqupkuoo7r/21932273944.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/91837555530.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/posefavevovet.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f036e04b38---kapururaranabisofaz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8494dd108c519eb32771681ec0c161da/fobeno.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1a78c7034---dipididokonik.pdfIn PDF document text
    • http://spiregene.com/image/files/20210707_134251.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d840c71337---jinojakitajelunu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/fopiriguvizemorosixakezi.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/melebad.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc06aa410f---lorariku.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/go1cd3i8k35hm689oclds7da4d/48069833098.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/navezasawixuv.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a570f88597f---vapesavebitafera.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ca653285d5---vufunewubolodetuzalisava.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/31276005201.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/navalukavo.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/sazekafevomeg.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_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 16172 bytes
SHA-256: 3762ae26e0e35ae0c01edc1d4c99cb7710e791bf9a00f6db9b0388e13ecf053d
font_01_sfnt_off00011751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 17968 bytes
SHA-256: 677ea2c3206f3f08e373cc9ea4cd9c7a71b410cc67bcf2b3c2258c982268cb25
font_02_sfnt_off0001471a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F31 10528 bytes
SHA-256: bceca9fb7176cfc5e3d3dfb9bad97947df3ea03052b029293070b4788a8d2a7e

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