Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f012e26e0b17e5…

MALICIOUS

PDF

92.7 KB Created: 2021-09-04 11:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c8ffb7ad6aaa9f9f9038e493cd60074 SHA-1: 3a93fae8a8794d2ac4a1320e48058613aba4b8a7 SHA-256: 86f012e26e0b17e5e285b80fbe0f15acf083bb329994b929b2d65692ea4c6bbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/15876436888.pdf In PDF document text
    • http://classicalgardenfountains.com/uplds/file/guvuti.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/fiduw.pdfIn PDF document text
    • http://artospace.com/pics/file/67867930462.pdfIn PDF document text
    • https://immobilgold.com/file/41391142843.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0e26c6751---67851682825.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4ebac2ff2a66c78300fb87a7e491c3b4/terolulironovuwolobef.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/bawoxoj.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0bb47d3f---29076347496.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/45543502850.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/94608540217.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1500c1bdbcd94121310074659a01c1e/71565864467.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210830231844.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/83700912481.pdfIn PDF document text
    • http://guowangcable.com/d/files/62837579055.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/80391718451.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/71139900912.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/sasugozi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/92237058835.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/34891011042.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f76d9cca390a521f5587a835badb6417/fezuxuvinabevenixesu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/71261393283.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/52765909791.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/ruluzuwadokizipikebaxegu.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/sobidax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=workers+participation+in+management+questionnaire+pdfPDF link annotation
    • 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_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11248 bytes
SHA-256: de48a5459b10322ad1a51043d1c2f63bd4ea8fafdd2f298b4c19c7cfcbb13242
font_01_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 18924 bytes
SHA-256: d81a7ef249d6cd5247a6e6e9e352d08961deb4da335a275db736acaff0db288e
font_02_sfnt_off00014c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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