Malicious PDF — malware analysis report

Static analysis result for SHA-256 495bd8d71ee32424…

MALICIOUS

PDF

83.7 KB Created: 2021-07-08 04:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71a03ca2ee6d6d5c4f8c6c7d6cdcbe9c SHA-1: 22874dd22e783f5701c88c306b5a787a800fd6fc SHA-256: 495bd8d71ee32424825e810bee5dea76ad052aaa8d49219b6688ae4df1c61a53
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sam-global.info/files/file/28848673007.pdf In PDF document text
    • https://campermagazine.tv/public/file/gopefipu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ppa9jkshaqerptkhscbd5ppt93/74073004927.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608422b571c6e---vuxebukubajeweliseta.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a59dd5dc---begosukamupefupenatosaw.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/45316477850.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/65540384157.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zeveremupakewewazepovu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2hco4pajig1gv04sumhl0nk0k2/kafomev.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bb872ede---dijolijaninajazi.pdfIn PDF document text
    • http://altinay-law.com/images/file/6029091785.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/62317055552.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3ff9eb56---zowigefexixo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b3bc323646b1bdcf41bf7642c1b1a4d1/90167671072.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/80608090252.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/34845629969.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/np392lu7nekv86i8odvvqs0l65/54856881147.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/berukopuludorixuxoz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/9h0nq0lhbl4upjisqhs1hmv169/kijefetofudisuragavepozi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0e85b5b4---12314663783.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9efe99fe8---devamesuxifekasisofe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607231eca2ee8---juxozajivevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+apply+excel+formula+to+entire+column+without+draggingPDF 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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16996 bytes
SHA-256: 1a794825236287b8010cc13e8d83191f54ee94a06302f19e24b60c0934d01e8c
font_01_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12714 11292 bytes
SHA-256: d2f9b7b84364833ea8f4d674d05b7c18b568a637ad814af8b33f5d53269bfc06

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