Malicious PDF — malware analysis report

Static analysis result for SHA-256 547862f151734c1c…

MALICIOUS

PDF

91.8 KB Created: 2021-06-27 06:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8b985c2f4457a5cd459e28e1ae71636 SHA-1: b52b242f49e0ab4d95781bcc78c2b6ff30e98ab8 SHA-256: 547862f151734c1cc44f7b4db3aae7e07d6fb65bdb059cef610e51b366139635
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nazrabilisim.com/calisma2/files/uploads/21796352845.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r5p4kka6hsedq0f719cp72pngc/3380552857.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/a3becb231587d4cbecf19820bf14f00e/54953409964.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c04fa84f38e887b52da2bda17d685a48/61328249445.pdf
    • https://247hvac.ca/fabulous1/uploads/files/fubisowos.pdf
    • http://huucodatlanh.com/userfiles/file/xisovimomibakevupenaxove.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf63560b9---12083130988.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1dbebbe6c---12922265628.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b611fb5326df1a5c041f61cfe41a2368/66098838685.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4b0ed08f1---fekaxonitagos.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bec26921a9---46929567984.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085371ba3ec9---jevumu.pdf
    • http://nicenpos.com/userData/board/file/guzamagetaluwelotiwewi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/551ebf16d6f9ab5b9d06f52b218d97dd/94407273811.pdf
    • http://www.centralperdana.com/file/bapufubudavosokot.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/vevapujulewuvutan.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160971b329f1a3---nesujanururotusotaralub.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3sv2aciqbpmhur0dfjn5vof9qv/pawexilobarebera.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b3c5d80c2---lotuwawajudariwaju.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/0a3a8e7a13cf0a2d33a499cc60b70d63/sulatebadaken.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/accd6cd7af6d0c23037d8ef01f615828/xujepubawiselolifolexa.pdf
    • http://asea-admin.com/_userfiles/file/20210509152200.pdf
    • http://alpha-th.com/userfiles/file/tixipisamelikesutabewim.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce16992e---93933801732.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607594c32ea1c---lanegurogejadi.pdf
    • http://liubeauty.com/luutru/files/60152913791.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dogs+from+a+dog%27s+purpose
    • 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_off00010680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
font_01_sfnt_off00011e92.bin
bf60613bd05488fb959c8487a007399e3dbd236fae52ae980c3cd5d5a3ea7104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 16584 bytes
font_02_sfnt_off000149c0.bin
aad51573e747b7b1996c2a7211cac639026c32342e15cb33cff24190c91d52aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149C0 10636 bytes

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