Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd508c81f6fa401…

MALICIOUS

PDF

88.1 KB Created: 2021-09-19 21:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23f2d177fe530950d35d6293509993ab SHA-1: 5cdd0212729fa46422662fd1f4a704fd065d4fa0 SHA-256: bfd508c81f6fa401f7f74e23fb7fc37ea53698b787dc53e7ad3bf1395e8f2837
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of multiple external links suggests a link farm or redirection strategy to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=openload+movies+bollywood PDF link annotation
    • http://infiniti.e-library.tw/uploads/files/dasarijapuwimusipelazug.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/69831268815.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3d83d12d777a25f1d95356640fc9aecb/63680196408.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394bc1831---nunisepawubefajegedip.pdfIn PDF document text
    • http://www.afoa.org.ar/backend/ckfinder/userfiles/files/nokagokapegol.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i8j3j500ckupbqnbhou4t9k60m/ruwitafesowumabatagixutof.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161448c31e09e0---57717826669.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/41262042085.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/10565012356.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/kowowifavided.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/69979198019.pdfIn PDF document text
    • http://bakoca.hu/files/file/94994331179.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/8994554718.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/zakugejadigukefemenavu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c4e849d12736ad7c68291e2a797b9174/jifosumolewifoduvug.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021090304340473499.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/rovenoxakanutuvilubod.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/77748218917.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/wuweweba.pdfIn PDF document text
    • http://rideco.hu/upload/file/xilikipotazalakufebisoru.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/bonogagigopuv.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 17956 bytes
SHA-256: b27345e600d0c7325d80478b367a3db91d8188c373b7d6b2404519637ccb1db4
font_01_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 10784 bytes
SHA-256: fbd500def58d827426019170367bbb9cca35a0820b0faaf832a88d54d93dacd4

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