Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c9d9601d75e0a3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 05:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ab94b6fea86b95cf3c5ab8429872be48 SHA-1: 9b12c0e65e5cc72cc3f4e46892d0d81d0981252b SHA-256: 65c9d9601d75e0a3bdd7ff2bf8eb8ecffef74e848a1c6d4e1b44882329a3235c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, one of which is associated with a compromised WordPress upload. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its true purpose. The presence of numerous external links, many hosted on potentially compromised or disposable domains, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=spoof+grindr+location+iphone PDF link annotation
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab09b2754e---29468945498.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/32284934828.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/43078259539.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/74893186447.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/83600423930.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/tusevaxuxubavesikozulidi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161338e1759644---foxevibudasejufobejen.pdfIn PDF document text
    • https://fishuntpesca.it/file/18329024698.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lua88b1sdgc0obe0e697nc9smk/14762362250.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/79256427937.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/durisavabasobu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/36345260071.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/mekutinilemijafufipibok.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/pozulefereloviv.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/76640695412.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/wekomuru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb00f01e5---1839413858.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/35955507917.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/dijakugiwil.pdfIn PDF document text
    • http://moristas.com/userfiles/files/jofisuwezigemibem.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/17e625076f143d2c896d8120bff9d708/kaxusulujegawomazade.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/pigaxonugotelumusuti.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/96240216245.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0088def0b8395e9d6b102dab0f7460d1/64600833566.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6f8e044---52860766987.pdfIn PDF document text
    • 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 17024 bytes
SHA-256: 456b0dd23bdcb14b80515ee1d3cc03e92c2545cf2e56f94846abea51bafe7c0d
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10804 bytes
SHA-256: 363e8fdb7dff834315677070373714df36a244ddfbd812998d8e46388d769eae
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1