Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cfca6daf067a83…

MALICIOUS

PDF

77.4 KB Created: 2021-09-06 10:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4860c287674588a3970251d208fc2e96 SHA-1: ffd9d69447f6c949ebc61c719b39b9cf4242dc59 SHA-256: 99cfca6daf067a837feaba473168fe6487711c755525efcbc5a21b2dbef90ccd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://amctop.com/board_data/editor_img/file/202105262149.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a84924a75---vaziloxigasozem.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/2055760509.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61e0c219a---dejoxafelapofimufanutu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7c3b20186---garafob.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69da5d8d9---sowovafusisoguxeze.pdfIn PDF document text
    • http://grabnerestriche.at/moxawodajarobuvaw.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/13976051191.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/soneda.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/mefebokem.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/fulivifefanunofusoz.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d4d8532d8261a4de2ed7e596b6f7d43e/9503495735.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/98gm0lg676e7c38tci210mev1b/meziminodasidatobasewopi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8jl66i98t74f9rphbjkg6u3pe7/naxilimogofim.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2nlefiqtleteukkquvc4t60n8o/41025826250.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a16c9b93c029fa9e1a1fd2c16727a0c1/43601513058.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/vasaditaziwo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/81596440207.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/zoxelarosidetovuxuk.pdfIn PDF document text
    • http://panteres.com/files/files/migokilogadizag.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/nuserewopazibukefugebi.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/dagemelepomexesoduluzeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=aiag+cqi+15+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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 10340 bytes
SHA-256: fd6c6c959e41282a3a3b2005afe13ffb688ff98423833809e7dcb8977b67d8ba
font_01_sfnt_off0000d9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 20984 bytes
SHA-256: b8f459bdbdd24cd003c01349fac73643bcfd664f266a3744fdea724c0c839142

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