Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef4139117655e04…

MALICIOUS

PDF

179.9 KB Created: 2021-07-01 14:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b2f69491646bb8d7a466531e5fd237b SHA-1: 10153d452eba2345ec562bdff87f1bc8e541fd00 SHA-256: bef4139117655e0474085a6cc1894be53378bef910428b7effb58b59393b67aa
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 appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of PDF link farm heuristics suggests an attempt to disguise malicious links or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9721

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814bdb04d1d---mojasavubapubipasaj.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/41479677605.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/fotegezoduneduf.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1413341a80cf4b98279aa3c73c50f50e/zajedelisimisiremuferive.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/66723118213.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/50o4odua5k2detirh0o6kck7ej/87472896256.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b96976e93---95790331126.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94533694645.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e813b1d4ac---74625757770.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/70099281064.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e86cae739---wogijotebufovivujul.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9c4f6be34c96fb0e8baef2965afc72b2/bunuboj.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b3fe97f8db55b0c256d0b78d15975ca5/befowujebib.pdfIn PDF document text
    • http://learningkey.org/userfiles/dokozoduzilata.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/63069132263.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/navudirije.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/nuteweliguzo.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7bc0eaa4---rawoz.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/51209329931.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f0126242c447bc52e6102e5a78b52356/lewegaturabis.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/60213095176.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/957d75e1e7f6b6d9e5ab2783dc1d22c9/55416442295.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/22629856079.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aada27c1071---netazebe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/43235041213.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/81370098853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=oracle+forms+10g+tutorial+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/70b3a240f21743a56385d6d8da0d418b/48016659187.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_off000260fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x260FA 11160 bytes
SHA-256: e35c7d9763ad3b37cdf2606ffb7cf689c55f1e49cd7526243ffe00c6d5c58cd1
font_01_sfnt_off00027af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AF0 17724 bytes
SHA-256: 8b4ed620d80932e48d49f0c395ab97450d02ff1013cc43583a89bdc6eceea425
font_02_sfnt_off0002a9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1