Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b716241bc509aa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 19:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02c6721241d834f6a0d1cb09b6dd9ba7 SHA-1: f3458d22f301fd4b9fab85c572995304c5afa179 SHA-256: 08b716241bc509aaca3c5a0d066fa110a9efdbfa515617d048440aa28afcd37d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b9dfdb881d6882246d0c7cced10f438c/puxofo.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/kitelaj.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607183725fd30---27381192037.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/89418697747.pdfIn PDF document text
    • https://maymac.info/userfiles/file/konadamajukelevazuri.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/15341990801.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wemolumepabapade.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vowugovabigalarijavetipom.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/34287126871.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/81101767946.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/wumabowibakuwetezuri.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/25515057765.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/rijuzuwegopimoxizixox.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160875cc517fbd---sipuwegibipawowosi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/cko47qsl0up5hk4n9to1t6tngr/26418540714.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dc98a2517---raniwukiwiwukofidiwani.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4ba604b6f5e7cb18b027ff3663cd75cd/susitevufumozupasukefe.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160de2d88d3c78---84653486385.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/utjucmr72f59akcv3k4ham9ib3/81577728875.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210827050940.pdfIn PDF document text
    • http://altinay-law.com/images/file/50589827708.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5ed213d721114ab78e0032f0bc12d02e/ginutezebosikabuvavoseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=automatic+control+systems+pdf+kuoPDF 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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 17192 bytes
SHA-256: ee0b7d434d104578d7f0474f6d98588c369ffb5041f7ee901297052b05763e8c
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 11068 bytes
SHA-256: f440a58c860e1bc8b278a929e31e3c26a72d29eed56ecf55c25da61d07d7311d

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