Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a5c637d4ee7dc0…

MALICIOUS

PDF

103.3 KB Created: 2021-09-04 03:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42b77d4abc2beeb3cae582eb23edfd05 SHA-1: c28001368bd72ddbad2e7df921e8989a1d058eca SHA-256: 07a5c637d4ee7dc0dfb19cb11de02d8863c10c4763c6fae89cd86d2c603b29b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. While no scripts were directly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608651c20333c---duwem.pdf In PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161120a7e14b6f---kojujosegupofipodoleji.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///14455947478.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a309ce570179338dfd40b952f5d7fe2e/34945084230.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b278eac99b9---kegunuziralu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609826753c332---siwederibo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c20acb4b6b6---soziteferojakomupowi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4033f711f7---83177630589.pdfIn PDF document text
    • http://24cvety.ru/upload/files/56399808928.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b8433de2---biwiwulakopu.pdfIn PDF document text
    • https://avflash.nl/upload/files/71528850597.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/labuteku.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/40939511979.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c24e06731ec81117efce28bd6bda727a/pupofisajujawupe.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/84662128842.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079450c2a827---87314030393.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9bdd7041f0f0ef3902c95619d3469804/jeligutorobosexonakika.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/dofadi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8220b1af387d39e1d30bcdb6dcd64492/93805776639.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/2122592740.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/zawurizuxi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a573e5dc1---kurubitaziwaten.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d815aa83e96e53e70cda8e9bf154b3ed/79478384823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nqs+pdf+2018PDF 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_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 18976 bytes
SHA-256: 23347efcf31294c7f1a8fd79f8ed0ea9626e704d92aa109f658bb4d10052e06b
font_01_sfnt_off000160aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000178c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C1 10264 bytes
SHA-256: ab848e08ebada893682fbe2d6b6c04a3c8a37974538566a5f57401cac84ba755

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