Malicious PDF — malware analysis report

Static analysis result for SHA-256 817485263bd4f4a2…

MALICIOUS

PDF

90.9 KB Created: 2021-07-02 02:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee3388cf876ac1697289b25d94c1955c SHA-1: ac4ec5c7f54e313a299da94837e405b6484a3cb9 SHA-256: 817485263bd4f4a22f43f81f564e96e97e8201cedb7797b86b9fc39bccc12b62
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://charivne.info/images/file/59525122574.pdf
    • http://ingmontagna.com/userfiles/files/wujubab.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/dagorumolido.pdf
    • http://emirates-offshore.com/uploads/image/file/46370786904.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0f8c73107---nedutafupakefolon.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/75681529201.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1643494d---37489637193.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce71e48003---zunopisujafik.pdf
    • http://atonoserver.com/userfiles/file/23135979763.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073db824e8d5---13225330532.pdf
    • http://agcslohian.com/userfiles/file/wozemet.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/15886693609.pdf
    • http://arniestribu.com/campannas/file/pewubunepedaje.pdf
    • http://aexpress.lv/index/images/up/file/rozabukotefojizakovi.pdf
    • http://s-privod.ru/userfiles/file/xovaxijixolo.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089caf2d5795---41963181656.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab9318448e---34570416749.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e89db0bf---11763396604.pdf
    • http://world-spa-resorts.com/dok/ferewuxeli.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/99a9c081213b255467251df06900f968/pedetikenunibudogovup.pdf
    • http://chinazzjx.com/d/files/31216558682.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ddo5fem88v3bflif4mr7dalm48/83704442859.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ada87b1d4a2---lijololezobagugijuxado.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=translocation+and+inversion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018f.bin
15f1f9284bd45f140c75f5f8ca2c71d303b9d0829aaf9c5ed47d05fa6c344edc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 17528 bytes
font_01_sfnt_off00012edf.bin
f1f17f161c523255f76c37faabf3a8a6b46013e3e8a1ce46c518593540bc4d7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 10392 bytes
font_02_sfnt_off0001468d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1468D 16792 bytes