Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41a3949bd061f63…

MALICIOUS

PDF

74.7 KB Created: 2021-09-03 16:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 312db6e5f430943ef3b902c8acba4084 SHA-1: 66c956870016e219a5aa0b4fb7aa78b83ceffb4d SHA-256: e41a3949bd061f6344191b9a77e3fe55c7f497770ec7dc038e7e573474185a68
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 designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://clinicaveterinariagussago.com/userfiles/files/99164435206.pdf In PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dokofapala.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160817e9180219---20367030979.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2ca5337863b7428255d1cb9f12a77d19/mewimewezasebotupoma.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/nojudivopalatamojeto.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48195fb26---patolox.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510ac0e6e9---94816481278.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/4425492864.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6f127e57e---61319765218.pdfIn PDF document text
    • http://halmar.info/userfiles/file/95642523742.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607033970a021---40410885694.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/3603471187.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/54232860530.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/fipikatudedix.pdfIn PDF document text
    • http://ijfbn.com/editor_up/66386397590.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba820636092---zuborubukamedinaxi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/71675416377.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166ed35ce2f---tafavopide.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xorezafogasusowujetex.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104ebd0f2bde---66681381560.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/mavozusugodigarenon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=behringer+eurolight+lc2412+dmx+lighting+controller+manualPDF 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_off0000bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 17320 bytes
SHA-256: b70aa29571617e41826d12a3366a19cf5d6cc195439b4baa9bbb6cb3d0931966
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 11152 bytes
SHA-256: c8a81ca99dbad3864034b77ed44357ef7020087cc483c128afca6584b1efa64a

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