Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fca8d58993a42dd…

MALICIOUS

PDF

128.5 KB Created: 2021-05-24 17:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8b8942685dad996e0e971a575eba9b23 SHA-1: 5043f61500fbdfaddab076928687407a72015d84 SHA-256: 1fca8d58993a42dd4852ce0345990cc3a7b58b0bb6e01b40791d42c9129a8418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to PDF files. While no scripts were extracted, the presence of these compromised links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0dl632uedsab9m6f67t95fhu0d/gaboxasomakanage.pdf In PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff24be415b---butofojoribijanete.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/88761848898.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0f933ab11---3416714081.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5da862d58---58500532264.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/cd82c9b259780c92cd17729fdc668437/17628079163.pdfIn PDF document text
    • http://industrialdevices.in/uploads/73732896964.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/9b39c45b9428268174fd34d810284ff4/50800902487.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608629adc6ba5---bexuloluwaduj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/516edeb9f73fe6a8c882d8e828e9e706/tavubenitewevefemusorozup.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/fepudoruxapiw.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853dbd3151d---lolurutukesopi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hnmg2vs0kstvqu9vhc6ouqgedk/fijuvikedaromiduweboval.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4256e0f42e741e504d164477493bb7a7/95276656865.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb84b87d---dumililepaxejim.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/76870629818.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/n2f0st4mfhukttq2vogb1r17v6/jexeduw.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/141a7ca1f91974d98680705188449e0d/50289169463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bird+foot+delta+examplePDF 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://scripts.sil.org/OFLIn 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_off00019eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EFF 5128 bytes
SHA-256: abe072fe7680d18eadce0f972c3cc93dd085e9ddb1d669184aed2c2c64c850c8
font_01_sfnt_off0001b05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B05F 13120 bytes
SHA-256: 57afea79c16ee336838ef6db10fb546b1ee7a0ee36c7097f340b9eac5ac64706
font_02_sfnt_off0001dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCE4 16352 bytes
SHA-256: f5280cb131b4dda06e5c13760c78797241992c346677ed313153598387cbcecb

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