Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4a77a1dbe13627…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 09:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eae8c6896f41ae7d58c9e606b846a640 SHA-1: b034b5cfbbd5db085a3c5694e417adc69745659d SHA-256: 1f4a77a1dbe13627af0c1cf09fcdbb4173374ef681ba5baf045ef29548f442fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://nomylo.ru/uplcv?utm_term=rumi+coleman+barks+pdf PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/69404981379.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/69285721164.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/41145472741.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4frd9g3fnuchrqfr3237hr75oj/29585275070.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/veroripurotodew.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4c9d5d560589fe28da722f74e85b1cc9/linomitinaximisivudodep.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/2633d460f7b53f50f4927df3f84ad78f/45449066123.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/44986517705.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/livugabivomezomawipezepoz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c8272d679---nujezebusaxudekevamaxisuj.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff2f0315a---fekusokefoj.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/99016519762.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/5714029870.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/72238654050.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6f02d89d---43740159797.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/1098878861.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2baa6d034---saguwesutuzukupimowab.pdfIn PDF document text
    • http://debden.org/userfiles/file/2792302453.pdfIn PDF document text
    • https://hagepoorter.be/files/files/7233169560.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/wufediven.pdfIn PDF document text
    • http://ezibra.pl/upload//file/27583298327.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59cc53a359---2871943773.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/3831196415.pdfIn PDF document text
    • http://punaide.com/userfiles/files/625333069.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 21368 bytes
SHA-256: dc3c61d49e6ad86f509461211bdb4f2f3d4403b39722516d5609ab100693f958
font_01_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 11060 bytes
SHA-256: f015dacdb4c243446a9ebd68a345c87c3e0b6b684dbd2944efb84a566202699f
font_02_sfnt_off00014421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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