Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e604f85398f22e4…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 12:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cf739b511d59067db085bb722c6062a SHA-1: f9677c2c0147eeccebb61bf2d38e50000a88645c SHA-256: 2e604f85398f22e4b4d484ae8658128ca9ddedfaef284784b0e1f8f09f3d9f6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=mp4mania+mobile+movies
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d8c4c19ca---12713766449.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/p0bjr2ft97durgrbfirj6fttj4/tixezud.pdf
    • http://yasaitogo.com/uploads/files/dutunuretoboxazoza.pdf
    • https://naoshima-habitant.com/36881993752.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/r31rhn5hmpt9njk4ov602ve9ca/fofojiwiwojotatolota.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64dbdefe---3358614349.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/64a670356faee75ad569fe38919366ca/83100196971.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/tetikanoper.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160723acb39759---87350040672.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764cce71306---67477689663.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb181b4c---78318335195.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9de18addb---domopumafimimulew.pdf
    • http://erdivigado.hu/userkepek/file/20219286629.pdf
    • https://hkparkkonutlari.com/image/files/72584076936.pdf
    • http://world-green-hope.com/uploads/files/51623322951.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075334ad5bea---sigujum.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/votidotetusenemu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd43273f00b64f21514645fe3efb4be8/potigudodarolupoxesaruxap.pdf
    • https://baongochoa.com/upload/file/senemu.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/81598156786.pdf
    • https://bahceneryaman.net/public/content-images/files/72765526979.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/tamolejosesaritizu.pdf
    • http://sns-russia.ru/userfiles/file/55237165810.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 16792 bytes
font_01_sfnt_off000102e4.bin
3f25cac4243c3e66b170c8cef50ef0f1c38bb3434dcb6247f93e397d29203c77
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 16820 bytes
font_02_sfnt_off00012e8c.bin
0acc8970c058514698da61e848767c544ceaaec1c47ccfbbddb830d8cd9656e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 10492 bytes