Malicious PDF — malware analysis report

Static analysis result for SHA-256 28211bad4b749fb4…

MALICIOUS

PDF

139.3 KB Created: 2021-07-01 09:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6641767aac8033b658363e341ac18bfe SHA-1: 6218897725cf877aff312a102f15247fb7906f00 SHA-256: 28211bad4b749fb42ff9b6df1be94080a0288fcdcf1dc3eb5b4dca0e1734d494
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of many external links points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://vansuloi.com/uploads/userfiles/file/xazowadi.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2167699e8b---lunejuvovavewedagub.pdf
    • http://yule-sign.com/upload/editor/file/20210604155143.pdf
    • http://bawaconstructions.com/editorData/file/18972332489.pdf
    • http://ciaooo.ru/uploades/userfiles/file/49538662641.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/45dc0f0725d431931ae54de2aba27240/65031650874.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/f4a98fd082a0ea52afe21ac1ebf27d13/61605677866.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609578db88a41---gonagujefep.pdf
    • https://morabia.fi/images/file/winujizegosufadukifovibe.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9db7a27a3---jotadoma.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fsnc9nvc9iqkvvptu8m9bkdfei/62097951654.pdf
    • http://besttailor.info/ckfinder/userfiles/files/99169883042.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/58d0a2f6295134df056482ac4037a713/pulinadafi.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c343b2a8aa---rulotadatozeguvidinimoden.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6pnhi71994p220kr0c35u2l5q1/guxopuzesomubazi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8f70a2d4---20200432243.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada9e1a20e---87132748477.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/at88l0di91kobac3r26t566sai/balixolatika.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ae68f6d72a59c90044abd18af13ef06b/dixudope.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b2687b10a4a---subawakobevudunijuxis.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6019fb21---85186479868.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540a8767da---8772838593.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083108469f1a---momojevugopagito.pdf
    • http://afghansolar.com/userfiles/file/lulijubemejibi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=panchatantra+stories+in+english+for+class+2
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a185.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A185 16792 bytes
font_01_sfnt_off0001b996.bin
8e53d0df7606de16e0980d4e97148545ad0a548d345c5a44f5d3f0aac34c0939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B996 16676 bytes
font_02_sfnt_off0001d13e.bin
966902dff43636cd7ea55f659596464067f025742111340921c51f1d48929562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D13E 22164 bytes
font_03_sfnt_off00020645.bin
6b07899d60ce411e1085fc79776dfc873456d51ccf30d64ceccf7976b14ee8ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20645 10736 bytes

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