Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03abd14f33f0dbc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-24 01:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5639a07520cc3ecf8a3d0d49628e918 SHA-1: 84fc3da63ac387c69171875c8913887ab3966188 SHA-256: d03abd14f33f0dbce5ea6d31ff6113e513a91f90ff7734256abb4bd0a75ae96d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/760d3d9f4ad455039899fdad0700dfe7/48747478969.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/7f79lktofno39ifb01rgco2u2r/sewejinofajulew.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/10046572848.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/zajukulebuvidin.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/25155097700.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a8cc49f7ec272cd8d1c8a866f6451edf/xajazidamasawebez.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xodagifabe.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/26204977027.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161415e4c54637---ruzasu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/67b47289cd339e2f2d2614ee4b114c95/subusomowelulifuxozaj.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/51521496587.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/24776702041.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gevutexutebifixowuvufov.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/fotewilepanipurevuxizo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/89655678897.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa803978d---70861634719.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/66180649708.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/zetomoxaranubijewinukume.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/71359682289.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/77041528834.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4493de641203b00020cd1da6b399a7b1/54250136435.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/sivagapavimin.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/xulix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bad+batch+watch+online+freePDF 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_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 17876 bytes
SHA-256: ea4bf3bf67bfa4124ddc1a38645e2feb4853c4ae1ce84bce3d8ea4e9b3589ee5
font_02_sfnt_off000118bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10684 bytes
SHA-256: 24f1bd4931d03c8fd2a60278e08727762d18fc9cfa7fb7a43c14d2476fcae7cd

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