Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ffce350e5f8e9b…

MALICIOUS

PDF

96.4 KB Created: 2021-09-05 07:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b1439c846de538fbd1ba9102ba6ebb5 SHA-1: 2dece4e950ebcf8297c0576eb0d033f7f4ffe854 SHA-256: 62ffce350e5f8e9b1f83408e39c2ec064a27df8ec3a4f81d455bdc254edb3b16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF acts as a link farm, pointing to various external domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://harchovyk.com/userfiles/file/dokiwigezevoxok.pdf In PDF document text
    • http://simpelms.nl/userfiles//files/nagotigitekebinofuvizovog.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f1070824ecd7b45c1e673793801d5fd8/dinidufoxowito.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/eefe4555d11b272b9f4cf0c7264d66a2/84740431606.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/60195640189.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ee4lirt6a04mi19mn1tc1dn2o5/xazeruza.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9a10a1f8---25148064002.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/dufafixozifudogu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/43118285344.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/49007554517.pdfIn PDF document text
    • https://digireg.cn/upload/51604356015.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/31763962336.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/legerixigefegiv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf225116e35---zuretawarutukiki.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/tuxifogud.pdfIn PDF document text
    • http://dytac.hk/userfiles/domapifazuvobed.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/lopobizutagewexilag.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dipaxufesejuganiwemovax.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kolozutikami.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/550dd79f82ef85c2866a4fd0dcafb4ad/depijode.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced788cea2---semuxamus.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/60775900167.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/pudorefulerunip.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/wiwesutazitixolidinubojub.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b32c7e9e1---dizukavapurazodaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=homelite+electric+chainsaw+ut43100+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_off0001136a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 11096 bytes
SHA-256: 3fb7a20b303cd59745b304346f62c926678e23834c15333019ef968dffe71ffb
font_01_sfnt_off00012d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454A 17920 bytes
SHA-256: 0d8f4a339112aa674304a5860fa3e646b84bb868beca01fb96ae121d102112ab

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