Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac86a2f936164e67…

MALICIOUS

PDF

95.6 KB Created: 2021-07-06 23:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 034f908bbb0b4e69a2a6b5e4c3aa6257 SHA-1: b68b073392be529ff07581d184a146e90ffe81f6 SHA-256: ac86a2f936164e671a6eb3f6ac6c49197d25293fe325d4e36dd630088ef65f44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://allytemp.ru/uplcv?utm_term=answer+key+in+statistics+and+probability+grade+11 PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92207c770---gixusogezajulenagixokopen.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2775056428---80848308994.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lezexuvekenejizeseneze.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/u3h8p4i342e3f9br8mlsdkgngv/30678466005.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d211c4ccc0---jonurifu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e6746262---14127265940.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1oqoqp2u6hk5eovqmk6571cfs2/21087634676.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7114d0db---87229714139.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacf80ba07---71709181852.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5bdded524---49600847072.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bigivigelabixifoj.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160701372047da---fijizazo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609591b90341b---12510783127.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/42661754609.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fa278e7a---2144505358.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/026a421331dd8fc356e8e8b0ea4b5f3d/30472038413.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be94b608a4d---33803593704.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca332e269b8---54156149456.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/39425537515.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/43149699527.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a10e6ecce25bf5ba7faf99edb106adef/tazujijabavujuzikifo.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f531be6ab043d359aa9e3833748e83fa/78011219031.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hjsrtfj99lsi9upp4gcvbbr0c6/tufokadelira.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b775ebbb45a---riliputipoze.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 17100 bytes
SHA-256: da628f106169d0226963091f466ad7bef45be0a3394e007cd89955902e5dad2e
font_01_sfnt_off00013e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001568d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568D 11152 bytes
SHA-256: 1f3077cbba2380a12ba7c27999116f7450f3805cd528d106c821996c7e0d7058