Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44b7a7245569f40…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 13:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c158db5052f6df632b8ce7954780601e SHA-1: d0fdf9bf797a76873d7b69c5deb6410f9cf91c56 SHA-256: b44b7a7245569f40cbc02aa901086741ef9400ac08d3df1144c042b6c728db58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=movie+download+app+apk+download PDF link annotation
    • https://kuepancong.com/contents/files/39581349540.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387dd518d21---97294147790.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/xalijamojil.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/67993108220.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mametu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a022e8edeb---rawil.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16131335b10acd---wosepa.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/57655376332.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/71892224248.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/tidope.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/73717312869.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/50597248639.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/ramogakubazup.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/17340883183.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/mejazexamudezasuz.pdfIn PDF document text
    • https://protrialse.eu/files/files/gazaker.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d0337701---14487689298.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gazalodusiwuwikuz.pdfIn PDF document text
    • https://majubesar.org/contents/files/41466887147.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dazadogibilososojelalojan.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/77642407589.pdfIn PDF document text
    • 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_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 18004 bytes
SHA-256: e2d40b4c47d8267c7ef76b928f76827e1ad81cc7862548498da51762e0286f3a
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 10256 bytes
SHA-256: fc2b17cc34f80338639cba1f93bfd8639f8e1760ce44e66289c6b1a3e5c6c549
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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