Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8712d78677b2480…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 04:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f290e969250cf5cb0967a559b235e93 SHA-1: c2d359a3b814aad18e823056e3a1fcaca2102a58 SHA-256: e8712d78677b2480e1d586c842ced2b98cdd3c54a06f607c3a7566dfe867ef7a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=run+out+meaning
    • https://acrgroup.nl/userfiles/file/maseju.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6a6ab95d95e6c5e0f908871dd695db89/34922143598.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607038ffe02d0---98251856394.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf29347548---retajadejijupinidasojog.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/09d715fe347061a994c2759b60513dcf/boduwamuzunebijajibeb.pdf
    • https://adepotcustom.com/UploadFiles/file/20210429083357100.pdf
    • https://digireg.it/upload/zazamiwojosatija.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bab3927bbfc---57864220081.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094718518b14---mazevupilutedabovikun.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jd68unb5o8ini3k05aj9unfkdg/7700574060.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i3g6a1k0k8fpsnk0tn9j20adj5/12446901068.pdf
    • http://temple.mo/userfiles/file/54831845646.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0cb9dd42---17230309447.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/1ef5aebe57b47c3e2aa6d9874a09658f/rulisabifiwal.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/157e9e95324585bd8059e9fa69ba858e/xuvokivulagadiledep.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c03460722e055b131cd70136d8570140/panawawigazimubarumonab.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a2590f877e1e362fe33581a3ab9ca5c5/nadufusupivonogutenikuxol.pdf
    • http://newmob.it/userfiles/files/32186374092.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf995a7b2ab---53076865348.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/822ff1f97885d9ecfc4e41731c2339dd/74254928235.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6e77f6f5b1d874b541092502157e80b4/bupukosofefapumaramepuve.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hcqrm6euemkfvs287prspg7e70/gawuw.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a56425c82---nuteserekibipufixi.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d15b2690e---soxonopudalafodipotogidi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec9.bin
4dfc39f9033ddbeed5cf5576e65cc0b0db22d8643b805bf97635149591d71971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10284 bytes
font_01_sfnt_off000105e8.bin
830eb564e7218fe5eaeca8b900b1b9b6a7710c357f26b44f16568fe8ce39026e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 17576 bytes
font_02_sfnt_off0001339a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes

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