Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2e843a78a0e1be…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 00:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de8bb32335af9fd8dc5a84eafd4d1eb7 SHA-1: 3f3272872790925d7e40807fa8339baaecbc2464 SHA-256: 7f2e843a78a0e1bee591a7970739f7969dd68cb4f0bdd85d862f1e7b1923474a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage, likely intended to redirect users to a malicious payload or phishing site. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/vexasesiz.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d6282d3e---raveninile.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j2t9g5cijedo54dt5q023qhe92/kewizemasunitu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210811150846.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/71976000022.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/68d4f14d97e10325f5a2601d4e3bb31b/patum.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f592be72754---vemadoninejivigagoli.pdfIn PDF document text
    • http://secretinvitation.net/images/files/6342737889.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/78597505222.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210623033015.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/acfa5097e76115072c0870a6f3c5fcbe/wokudamifo.pdfIn PDF document text
    • https://la-klamm.org/Files/files/76663494676.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/77960080441.pdfIn PDF document text
    • https://medtek.vn/storage/file/bijesokedo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30de5676---vakoxuf.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xarumag.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f001f506---14302465801.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082abdf1401c---80122066900.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/88629560344.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/gisogitej.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/95433674066.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/muribuzoxem.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/mugevijipurejiwanowamet.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jvb0sjf2trrf1b3ei66s48v850/41691925058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=static+aeroelasticity+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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10700 bytes
SHA-256: 58fbc3ff8dfe660131ae0e77469b2aaa8008621cadf066328216f26e37d23e20
font_02_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 18424 bytes
SHA-256: 82c899a14934454a1685d01db42651ae91d11db53acf8bca3aac4654049c7fee

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