Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32a1c74706b524b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 17:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5ca255b137915732358fffc553cc09b SHA-1: 54bb3e42366e1573b66be83e77d06692afd7830a SHA-256: f32a1c74706b524bcb8941a6075d9f6b3b47583323c63c20125144ccb86d3adc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or 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 distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jbdclothiers.net/emailer/userfiles/file/nenekipuwusokenopetun.pdf In PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/84438397892.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/tamavebub.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/garifinumupemet.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/42f38fcdb3da9f08937f14d03c41d12d/gimerapemuxawasejeto.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/zonebaxipavukewuzuteru.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/56856134094.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c016b689da---14073643498.pdfIn PDF document text
    • http://namngonviet.com/user-/files/64440122060.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/funefegiwepexege.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/64032504651.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/26262027668.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/jinawupitibin.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210905102846.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/avieesm28pn8c28g3r89bmnf65/3013718570.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/37814631499.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/51141539815.pdfIn PDF document text
    • http://capri.lt/userfiles/files/63868366795.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/8040095601.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/xumovawaxibuvixizudet.pdfIn PDF document text
    • http://www.centralperdana.com/file/6566106034.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/turopetiwigo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310024a52c9---76603326248.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/sipiselegadat.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/puketozuwabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+android+app+icon+in+photoshopPDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 18000 bytes
SHA-256: 75ae7d718fd9f19795835a197c31fb5af2d9563bb6351cd539ed32c1162a109c
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 10904 bytes
SHA-256: a7280aefbe283e55db8e53e7e9e1281d5aa206873645acf67275dfc07939d118
font_02_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1