Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf693fd8a8e357b…

MALICIOUS

PDF

101.9 KB Created: 2021-07-20 20:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b2d8b0f8752c72d593734f16afe8cb0 SHA-1: 038ab68caeddd47328a6c934a0491f63465f70d7 SHA-256: bdf693fd8a8e357b7a14ad3b9365daa5aa3c5f81a4d3fc8ba61725514879c940
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://studioingegneramato.com/userfiles/files/xopalabakuv.pdf In PDF document text
    • https://dagvandearchitectuur.be/_files/file/95015782728.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/kokazitava.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/tusega.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cd1f0b3a---zunenuwiduxazelujirugu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4189c56d0e---sogijokojexobevolotuv.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/736441616.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0102dd677979a36d172da832d47185d0/selokukujitevak.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/34411709642.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/40079653788.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/54274876485.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0965845796---40988135594.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c31875a94700b88e50776e5c13822e44/fumibupinetup.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/936bcd75d82ca8df19e40d435f187d27/bezoburubugufape.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af265e66ecc---42736255143.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d85e56b47af---30905262079.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/30461237196.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/q8pop1o4o9k4l0h20kkpigoqqe/gipemuruteruvakog.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8af00570---gevuluwiwitis.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/88315194875.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94443188564.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/08en41cctlk9bbhr13ppuqnv81/39932988320.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/79570518934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=101+youth+football+coaching+sessions+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
stream_004_off00013482.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13482 23236 bytes
SHA-256: 7cd321ce7b1bcadddfc175e42a894df7189d32ca9de845bae3bb46e26b522da3
font_00_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 11228 bytes
SHA-256: ec73f8540ebdd3aa9bed7d3b23bf9b2c4b25949e86fbf22d378fe59a6f32c895
font_03_sfnt_off00015d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D34 17152 bytes
SHA-256: 22d0ae15044a538c03a674ee66917bfe843a1c2e0692b69b7fbd8de6fc9acef8

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