Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb83cdf0282ecdf…

MALICIOUS

PDF

114.2 KB Created: 2021-07-10 13:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20b6461765fde21cb3100eacedc81bd7 SHA-1: 3544e9eecaba5fc85ac87dd129374f785902c2c5 SHA-256: 2fb83cdf0282ecdf4f04e1fd6d25cd0912a4c6be9042d52b7d3a4c8077df8a34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8e38cbb0---nazuneropaje.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd3f99cc1351cde16113c54482a5931d/minudadepegu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59385396301.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/52cce9180df81bf4b0a11187ea4abff8/31068693897.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/86114450578.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3524e8e6df846be27f00a48885f3ab9b/vatuzepexezuxigab.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zototodi.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/2403183985.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/7e1f9251d879c432de7a82ac7b50b306/sofajegenejofoz.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609892cbb7c6e---tuduvikizidad.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/wuvinimosinesuli.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97583377227.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160892e3f8032a---tivebexuxaw.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160915bf12d876---28445731764.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4658c4230c---fobufebo.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/samajinexino.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/df8cefa92d17ca9824e37e203e130354/dogipadisolejepeluroku.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b2015fbaac24d0229cc02ab9303a375b/durajazifezasemabakubipok.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ecd472263b57d8ad2ef53aa1a8a5a114/jokaramuz.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601d36ba7d---76923164552.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/58967601025.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ade786807b5---xipenomudakoze.pdfIn PDF document text
    • http://poorclarescork.ie/images/kutibojokeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+dreamer+examines+his+pillowPDF 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_off00015fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000177b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B3 16996 bytes
SHA-256: abca6612039bc2d25cf4eb44d5e2d18ce15d1f6f9f621484f7ba5b82d63d0b7f
font_02_sfnt_off0001a419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A419 10708 bytes
SHA-256: a1f76a94a6fc98c5f73b339a446ed06935ef1960ad66a35d7ed59526f1eff8cb

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