Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03756fe04d00c4f…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 04:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 637bbd6e8317dccf29c2fe481537773e SHA-1: c0c820af59c1070b6503c7f6ef1233026aa33a3a SHA-256: e03756fe04d00c4fed649add2884448240fc15828f16cdb2fb99f19b0c7ea92e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs and the nature of the heuristics strongly suggest a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anup.bo/images/files/31372394320.pdf In PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/79780749561.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfea858727---fazobusiluvu.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/40293771816.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/32115639545.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161339d16dbc44---76780006059.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/morajowupipesafu.pdfIn PDF document text
    • https://olterus.com/contents/files/lubukibuwiwizojowedo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5a0eabb0---mamubobuvoxunulasaliduke.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613568b9d34fc---21858203448.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/baruzatilisutubozowa.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/68284581111.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/sesuraxete.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/xasopezesukazujatiwaxul.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/777357948.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/41973656823.pdfIn PDF document text
    • http://wsm.hk/images/files/sogasodegixep.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/rawodaxur.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/29899486368.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/nisasasovimoxifofovuro.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ohcuctnne1845uo9kucaqr8q8r/pajebirekotexatiluzamas.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/92239672550.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/23375478172.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/29514530803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=codm+mod+menuPDF 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_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 17552 bytes
SHA-256: 6e8cb97e22c4c19b104618370a6a4aed0a8cbd1e3e3b3f25cfb6c3ca10618543
font_01_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 9872 bytes
SHA-256: f7c63627fbff96d97797185c8f0813093926965bdba4905310f8b80200253ae3

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