Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc6b6bf7af197ec…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 23:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 490d3b9ff615e5b3a61afc69fa5b1422 SHA-1: 2804383d3396162a9b7bba02035d29e338c6d8d6 SHA-256: 2dc6b6bf7af197ec30423a6c941ef65ef50835a172934e16dae160018b168205
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=mutual+agreement+to+terminate+employment+contract+template
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089616bb0fc1---74742769959.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c73d7a11396---34876166619.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1f690b19---34793129831.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/35001176963.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c069340eac5---93416527088.pdf
    • http://bettaletroom.com/file_media/file_image/file/sajesagedene.pdf
    • https://zlatartopalovic.rs//files/21011684406.pdf
    • http://ausafe.net/images/art/files/deguzi.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071635c25b9f---nasuligapetugisizuzor.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v9q55kp2g90prldolf8f0vkcm5/39945414309.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/pinukidusuxixajugifej.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/47788820720.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a8dd4ec0---91176716071.pdf
    • http://adaviestransportltd.com/userfiles/file/febigutubanudavogilujimuj.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/k6stqjml0ahsj890i50dltnseu/40068260771.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/3f0e3d98c74f9a4e07c3151226d3a4be/rodufiz.pdf
    • http://abogarestudio.com/userfiles/file/89272478865.pdf
    • http://champaigncursillo.com/userfiles/file/53249608000.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d29e3f8f---81572252287.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46d72b4d4---nekupixokutaninajere.pdf
    • http://mywayrtk.info/userfiles/file/67186633582.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/mikowew.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb063028cf---79280134517.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_off0000e60c.bin
9d91f59be9b2ef62d2f44de2100e95f37adead6d81e3dcf739d11b8e1c563689
pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 17920 bytes
font_01_sfnt_off000113d0.bin
5fa53de7138125c016cb635f654bcbb80593f6b255de3cbbb1e74600f708bdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 10756 bytes
font_02_sfnt_off00012c8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 16792 bytes