Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0de3e506dd04d59…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 13:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bf0bdf3bfcb31a04f92125caa927f6e SHA-1: bb2ccc33205e405cb576fc10c7cf1385fb89e557 SHA-256: e0de3e506dd04d594202b127ec502b477b3cd19918e78a6920546b57f0fb379a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to download malicious content. The document body is unreadable, but the heuristics and URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.mmgrowersg.com/ckfinder/userfiles/files/89404835024.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6beb616608282f38037726a00fd66fa7/57363627730.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gefojomo.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/zunenolodopet.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/24294223353.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/93203413472.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb60483b1---16310065670.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613653fd510c7---tojaverepaxenovunazupib.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/54632960191.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/6518328143.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613beb52aedda---patij.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/venodefamud.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c78e2dab9---jedizutemi.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/60432432714.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/xopatosezogibubosed.pdfIn PDF document text
    • https://uudanbury.life/files/file/rojidixa.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/potoresegaxupelet.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64126505028.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/dawifubafudifaji.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921111718.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/27820798789.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/87919815788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=aplikasi+download+movie+subtitle+indonesiaPDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 10916 bytes
SHA-256: 9097c30edef6ef9b7c9122de0c969d042dc17f3bd701525594bb5e777691f0e7
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 17348 bytes
SHA-256: d432cb683981313115137775d8295d76285b7c2f9351947242fb226628d5ec0a
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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