Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63ae82b506e3ef0…

MALICIOUS

PDF

90.3 KB Created: 2021-07-27 19:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd5dad18d36a94f3261b5ab2f0318c6d SHA-1: b2c234da4dbedba8b28764c2390d599ccaccd7d8 SHA-256: f63ae82b506e3ef099b6368acd1219636810ba644365f5ef89ad0be351265de6
164 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://cuatro-pr.org/sites/default/files/file/sufudebafinubujepo.pdf In PDF document text
    • https://eletvital.hu/uploads/files/16622454976.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/22372427371.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/jesuwesiv.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/zazopuluvosikokawivot.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/zilifiguzubigixonam.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fe334b86259---92570300073.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5420a437a---malofew.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96107976066.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/95963996291.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/fubizavokufubu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/82631741647.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608380389b318---sesanowawov.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/notuvexuxodimubagunebi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609425491dba9---pajugagek.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/fugokizonamonifiluf.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49a4ede76---lasewevujizuxesuve.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/48120088429.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/68536036279.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750f2003a47---55776622388.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758273b5792---69490688047.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0a9cdb1c---papagivusogiwekawatetafuz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/4ae49bb0edc4b268127b7ce0e63553cb/fufolopixufudokokiv.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ca9cdcc7---20731556363.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed303ebd2b---7518290497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=area+of+a+triangle+without+height+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 17116 bytes
SHA-256: 004190f86d81b8e3d2492f6e6ab522eee1b2f77ffb8437415961a2dc53a9412a
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 10752 bytes
SHA-256: 9dd3de5abba9b1df76db556ff312ee576e1873977c0f1e16fcb532018eeef5f3
font_03_sfnt_off000144de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DE 16088 bytes
SHA-256: 9097553d388de6ba0c4695ab3f5748207509627cf951ebf2c052ca71e31497d2

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