Malicious PDF — malware analysis report

Static analysis result for SHA-256 17038595723dabc5…

MALICIOUS

PDF

101.9 KB Created: 2021-07-07 18:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79efc91eb64d884d59b8ad96ffef9151 SHA-1: f76af8c0cc93051b27514a0edaeb66a1bc56a092 SHA-256: 17038595723dabc5eddb8c6b9f181d86d45f5755ee5d100670c01123676ab2cc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609625e417f9a---12550327614.pdf In PDF document text
    • http://kururlaub-ungarn.de/bilder/files/mubamapozon.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zovokemapexovalivujokop.pdfIn PDF document text
    • https://puppometalli.eu/file/femosojoxulejapam.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/94046791574.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/dedudivigevigi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f71bc599f---vesiz.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/zedelidupaxaminutu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/64ea6024674627470c9e86964a70625c/33163861773.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kjo4jo76dnqqoj793u8q4i8887/57565269725.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/9767128add8d9def9031a218ad00c622/tilebejinijidivasa.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/34304227140.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beef737d76b---54844488135.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/obmepu7l6fbiqgm8p9nc3c8l3e/99765037045.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608083b310bbf---98482078083.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814ec3b3efa---65341047819.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/nirefagopuxux.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7d276590---nesaluwajo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/totuvlrp2q4qi79hs8gdcak3gt/38110471339.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911b8385b45---sevalarefunabofazoxuni.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081be9482495---witimizekovoxuvixasifuwo.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/97414633600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=medical+ethics+lecture+notes+pdfPDF 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_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 17648 bytes
SHA-256: fc8908efea590a14e5dcf029b1376bb162c793a10d7dfb9054e7dab1f0913004
font_01_sfnt_off0001371e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371E 10812 bytes
SHA-256: 85377e8e2c62d689c65fa2aff74f532ef63881825d9407289c9cae8df839994c
font_02_sfnt_off00014fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEE 20000 bytes
SHA-256: 506ea8effd99037fdf4666141459e3daf30e3e139894ef12e85ce2e813daa427
font_03_sfnt_off00017075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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