Malicious PDF — malware analysis report

Static analysis result for SHA-256 82feca0615b19a9e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 11:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0336eb28ee7fc6b5b8f3bb2ed23c28bb SHA-1: 98e4b35cfe78d8ff75d2c48b8e6dbb05a1ccd70d SHA-256: 82feca0615b19a9e544b794ffb0ed9ef53fcf8cd5323120a50e71c8c159c1397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, with numerous embedded URLs. While no scripts were directly extracted, the nature of the link farm suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://jgweld18.com/UploadFile/file/20210910143456706.pdf In PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/19169656546.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kajimubokonubu.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/fubale.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/43126337001.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02daa1771---38245164723.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/witogadavikobotate.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/64126255379.pdfIn PDF document text
    • http://cy2hand.com/userfiles/ziborazux.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/64429095684.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcfb0af11---nupumuruki.pdfIn PDF document text
    • https://cardolf.ro/files/joxeboginofelunixawekabe.pdfIn PDF document text
    • http://chengzechem.com/upload/files/9827425486.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tazimafofuga.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/bafipi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cb35fbe32475fee099e67a0d3a3dfddd/wososufileziwipejojobogot.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/46637604653.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/dazizobejotakikezaripu.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/6692665311.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/42924979792.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136463812f9e---pudemoderubatibexaz.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/bezajetafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nokia+lumia+530+android+installPDF 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_off0000b8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DC 10876 bytes
SHA-256: 9442a7ff15f11404b3a67d53b32f09cdaabc247707eccc06bff46d11c0b18bfb
font_01_sfnt_off0000d1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 22564 bytes
SHA-256: cf301afb56cba4f04002588214e00fbe0af9b1a70a58490fd807d79ae4925c0d
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000122ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EA 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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