Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab234d1efab30aa…

MALICIOUS

PDF

85.0 KB Created: 2021-07-05 01:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c7a96e756629e5202ca8bd936dd5bf81 SHA-1: 0c9aeb4001c663e68c17c7d5654be3f054c13ce7 SHA-256: 1ab234d1efab30aa4c64fa6355fac3a90e059977a8ce8aa654ae12781cd50db0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, functioning as a link farm. These links likely serve to redirect users to phishing sites or download further malicious payloads, aligning with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7053ff0b00---50843414366.pdf In PDF document text
    • https://sasalidayanisma.org/uploads/file/93758442952.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/sunirasofobozemuvejapuvab.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbfc054c4---34752501640.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/67340ae2610be21d89503954a1c22ccc/kotebajuda.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/47622874579.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216282045432951.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/100150143322.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e4bd8337ba9c01ea5ba8105d7655d73b/sokexupexugirojuxavu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/lkorigpt5dueq8q746q0gv6s20/97114808446.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853aad3ff36---91169078904.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/kapigafitek.pdfIn PDF document text
    • https://faceless.me/userfiles/files/35735529293.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/jinagebazetujakom.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/96945995590.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/gupodugipeviw.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/lukevifobox.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a0f92b62---koviwafu.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c4f3260---55173693009.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/3f36c9d974bb6c7e44ac8fe31bd88c29/45275475481.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80955eeaa---pizobadopividosutularob.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/visefebugimonuvowuseb.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/solubaburugixidufamegevab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=starter+for+salmon+main+coursePDF 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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10672 bytes
SHA-256: 57a7d50813d8b65ffc91a0cb3b87f4e97192b7d6efb71357777cd9002748b2f6
font_02_sfnt_off00011b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B05 17288 bytes
SHA-256: fc56f18f575770d7d0fcf9419de06f3105b0e5bec097f858e0a4ae58a2ac517e

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