Malicious PDF — malware analysis report

Static analysis result for SHA-256 946d37e4241e867a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 10:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ad5b203078ace5d25e8255022ec98a7 SHA-1: 9a0862ab673688b7591d6ea28bb1dc814ffec836 SHA-256: 946d37e4241e867a3fb1d0557ac00c5b4f3adc532b504351cacf70b454fb6874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b81bc6691d807f64e788731dbaaf6fb4/vasimevujitewev.pdf In PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/45633561801.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b5e455eaa441dd7a8719e0a6b0cf5357/40148117320.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/zomiwezafibudidiw.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/muvidufuzatew.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/ravunigomogozefefurof.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bimud.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sikikilokalilupal.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/9172651910.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/wukevor.pdfIn PDF document text
    • http://rooptex.com/uploads/sidotenofilopereb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe86258a1---51016260903.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/77800103834.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/tijuvurexizo.pdfIn PDF document text
    • http://abnicum.ru/files/file/44025222630.pdfIn PDF document text
    • http://cycling-software.com/files/file/xofibobofimezawuda.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c9055a4c---wudawulaxomigonepowu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e363e7f4fec7cf5a3c1f6323ecdf1b73/jopopixini.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/pakuxanogusom.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/butasekaxesezazojuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+arc+shape+xmlPDF 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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 16364 bytes
SHA-256: 56a86f3cd256a81b25ab99bda5ffa9148b497da22742a63eca8751825f1930ef
font_01_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 15952 bytes
SHA-256: 2fb3196de3b2e29afc9e8f4c066b22b71698aac33036642aef69adbd018efe3e
font_02_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1