Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65227a20161423c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbce805c9384362c686fcf7e3768c2f7 SHA-1: 401b67ec526068430b87c21b07ae4cca8c0844fe SHA-256: c65227a20161423c7523c341a45bacf9e112dadc16f23a7c09d0edf30b0a5f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c801c71323---kawomiti.pdf In PDF document text
    • http://svb-volleyball.de/userfiles/file/34729527978.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6ba924418403612d09685852b4af127c/gofitejazibite.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/wadubuzikodefiko.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/logewis.pdfIn PDF document text
    • http://learningkey.org/userfiles/59228050419.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/64500264758.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b007a5628eb---2596515422.pdfIn PDF document text
    • http://strandedtattoo.net/file/wadimexuvupen.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/72b7e4ad69c829f344a524cf0de94e09/tinajozinunida.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/86664250998.pdfIn PDF document text
    • http://davcpundri.com/css/file/72728137161.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b12cfeba9876b6789d7356d83717b2da/56686787067.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be1b03b56a1---64539390073.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1c1bd3ecedbc85c4bc6d864b47664551/fuwebaratudaverirufasibi.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/nagibinevagabedebaf.pdfIn PDF document text
    • http://vhz.cz/user-files/80517842877.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/zaroresozuxavusuzevi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wezeras.pdfIn PDF document text
    • http://short-story.ru/upload/file/ledizenawarasubeginotu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/nurabifena.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c991354a8c---81810420750.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/saxawufosixuviwawewezu.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/febigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=glycogen+synthesis+steps+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 16740 bytes
SHA-256: d4cddc6985a9fb319c1da4be8ec0e3f4d8857347d81d7c076d6bdaeac54dcebd
font_02_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10788 bytes
SHA-256: b2f8e4ae52b355bdb7379c7138a28b6c0510a8b1dae1054c852a182c7ab06de0

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