Malicious PDF — malware analysis report

Static analysis result for SHA-256 800d5abbc0f4f3d7…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 11:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 942256bc400a84f26e25715a1881ef6d SHA-1: 39ac5a3bee130e69c8ef3e94403bf07e1cff65b2 SHA-256: 800d5abbc0f4f3d7c5968313f1c583632d15bb9b8efc0ba0e934b3ccd7265d07
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that exhibits characteristics of a malicious phishing lure. Heuristics indicate a malformed exploit stream and a link farm pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic specifically points to a social-engineering tactic designed to trick users into installing unwanted software, likely to facilitate credential theft or malware installation. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://acrgroup.nl/userfiles/file/wekesularidoxafurelurupux.pdf In PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/mukudad.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/79809186106.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/tapuw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfd40befe0---xadobuzonogu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/46519077231.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/92837820770.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/53540149089.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/52088040271.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fkb2trb82un172dp96g8ncgls2/tuderofekeji.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161374e3678b32---begoxowefovowulonazo.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/dazozudugawa.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/58261877758.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ad2db6a0---vejigujubedabexavo.pdfIn PDF document text
    • http://eva.am/files/08746f357cfd8058.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/70305c52c6ef0c9e0bd44bd30b5862ec/pinixakeles.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sijugufelugediruluw.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/mivazitizete.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wabala.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/bumogudatilukulafodur.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/jijonoxavumobubozegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=zoom+video+call+app+for+pcPDF 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_off0000b01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82C 16476 bytes
SHA-256: ed89a257626042e5261cdc703bffdc6d5558fcecd0d62de7296d4d038d933d5f
font_02_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 10440 bytes
SHA-256: f6db94c3c2f46ce0599964244b5caca8528603acda1c2c91d9d006739dd3dc0e

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