Malicious PDF — malware analysis report

Static analysis result for SHA-256 62fb25a43b42a244…

MALICIOUS

PDF

77.1 KB Created: 2021-07-03 07:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b08016aa331497eabb833941fa6181cd SHA-1: 34d7f67e645c6b28e6094236b8bcc1c1e045b2ff SHA-256: 62fb25a43b42a2448ddc9735b2dc6e8e0ee76578ca5f4f0d8cb38ee349d0b62b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users. The PDF's structure and the presence of multiple external links indicate an attempt to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://koryosushi.com/uploads/files/dejuwade.pdf In PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/56237512012.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gurapebokofajususo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c571a8edf---10217299137.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9965e45d9---64576362006.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/wajogeleranave.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/betuvakifonomuj.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcbe303800---roleniboteruvumuxir.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kin8mmalcs0ho1rta11q4t82t5/nazujopibegonikabanurari.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fe9c0b15826aa3068f60b94099a1e4c6/parutuserovotexebuloniv.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/29082217567.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0dac4a96fcc8dda5ade7d9fbffc86a79/milajelirozudeso.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d74f5ac6e5c---fewagib.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/772d1ba0ac122105a2026cae0328ecb2/fupuzirana.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8b6o12kpjjfa5fpq3fpms05ab4/lerixiparales.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e7abc828d5fc01cb8aa5b5811bc11742/90965205065.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b00e545a---fakawonegeb.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/tubegixaxinexetedunusunuw.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422cb99341---jelekinajifokojixojig.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0837c584f02486a867a356c9f5fb449c/vopubezakupumewoladupux.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/16470925435.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/zifizepi.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///54104032065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=copper+acetate+electroplatingPDF 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_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 10412 bytes
SHA-256: 7ca4b737f0f49f2b71d119877c990611b368eb37f7ce915a8eb2cba5806fa28b
font_01_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 16124 bytes
SHA-256: 5a33c7238ecb6db339810f1c0574ade655ad9554439f4064a7fd8d00eb65e43f

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