Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf54e05259bdc9e…

MALICIOUS

PDF

80.3 KB Created: 2021-07-15 18:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d31363c2521e1588488d30407c28e689 SHA-1: a1babab7a000b537065ae1287e8482540fa2fa8d SHA-256: cbf54e05259bdc9e9bf5fce341a4231ecb2a09e1240f52fbd33015118d5dba8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c57cba3b---finutuzujupu.pdf In PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210708_1C4BFC4302C13638.pdfIn PDF document text
    • https://ikima.fr/uploads/file/47084319077.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbbbc205e1---80039201449.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/puxomosikafewizuxe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3108b9464d22f2f612b15b2c3e15b195/duxujojuwebaxejul.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jitixineluxila.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/jizuvujenumufux.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/7772467655.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8baf359fb2---jotozexi.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/jatamepuj.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/03c25773624b86aa332bb7e06af9fb5c/lugowemojovuwufapojugi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/kegejezate.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16082c58bb1796---kuxakafozorix.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c466a9c8b17---16324612756.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/93a6416c15aa1650041291d1194eb522/27936850786.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dc69cfa8---8812614016.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/kawajexerebokusisaxo.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a9ff6b755c1b88b47c6f5781eb2c2082/nagolanetemoponere.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/43978354993.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/8fdba4de9886b5f4638ae42332c99104/ruluvemalajipovo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/32805196ddc9619dfb26aefe08cd184a/jewemijekejenot.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/bobikamuxebujibikewakoxaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=5+fractions+of+crude+oilPDF 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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16816 bytes
SHA-256: d0e08c76c6ac2a3d2471a4a4af2ca0992ba20c4f943bdc1726916062dd4644ca
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10608 bytes
SHA-256: bdc6fb4f4ca2d1610b803702283d4f0059a72875b2a27dad75835ab4a7f46007
font_02_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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