Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ed355fce90c6e…

MALICIOUS

PDF

98.9 KB Created: 2021-06-25 20:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b9941f88b4521d0bf136d24495167d4 SHA-1: 26dbeddd008ebdbde1d141699871e969a5671225 SHA-256: 753ed355fce90c6e5e3c8c926b9b4c8a8e863114c273cf97f9ef9fe0824c7b5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristic suggest the PDF is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://synerhu.ru/uplcv?utm_term=star+wars+battlefront+2+how+to+download+mods
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45bedc540---39180978033.pdf
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/risura.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b99510d7a68---xugutopabas.pdf
    • http://4seasonstours.in/userfiles/file/begabirijerorafusogaw.pdf
    • http://curry-box-deluxe.de/userfiles/file/66917225093.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/b44ab7451f75115e60435a8c20fe3597/76276466930.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9eli18n29q0uot41bn814th1a0/nonanugigiduka.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7c14ce2f914f46562a642ede4fbf6a0b/togisedoribo.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d00d8c5fe93d4160493b0da1c878ae45/karekigidonaribibezik.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1a600ts68nmcvrjgjd76f4dodc/56801607530.pdf
    • https://actor-conseil.com/files/file/zanuz.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/389jh7k4hqef5idnqvk5hofabn/21957607488.pdf
    • http://akkoryazilim.com/userfiles/file/todopujotamomeloj.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/6a5edf85c1303be7f6b591f9ee835dfc/41946077551.pdf
    • http://hgbs.de/userfiles/file/25967786926.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8851a5a6e3---83435645487.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb71e284db---vaferadokeri.pdf
    • http://tfforming.ru/d/files/7457006516.pdf
    • http://libertyquad72.fr/userfiles/file/defebebokevixet.pdf
    • https://alexandrapanayotou.com/web/images/static/file/weladewafitokenuzoraze.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092cef32cdb3---nikipigibi.pdf
    • https://aspaeng.com/files/image/files/8270941520.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160942bcbd13a1---nanotupeboxegifokawivo.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/37174744661.pdf
    • 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_off00010771.bin
d6e4eb56be69b8504db29de3f3e9e25b2ae371b414d0b0201b81ce0add6d5184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 18020 bytes
font_01_sfnt_off0001370c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1370C 16792 bytes
font_02_sfnt_off00014f1d.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1D 16164 bytes
font_03_sfnt_off00016494.bin
14d4fc9de045105eca0ac856675c08d9e13707651dd69bc933f1d61849a320a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16494 10948 bytes

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