Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a076c0703f1f368…

MALICIOUS

PDF

82.2 KB Created: 2021-08-29 14:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e1bae883d78d0fb1292ee0a573c0bd7 SHA-1: 20924a8689d8393df27a420647f5742bd3e3de29 SHA-256: 1a076c0703f1f3681e59ca110dffa1ab9af00437dc8bfcb5c182153ffe31b80e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to obscure the final destination. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures that often employ JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/sdham2ube96m0l6qsj4soh9fs0/jinejog.pdf In PDF document text
    • https://iqmuseum.mn/uploads/files/15369695421.pdfIn PDF document text
    • http://yuli-china.ru/d/files/86447963189.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/62221623007.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/74185061344.pdfIn PDF document text
    • http://packamate.com/userfiles/14994745227.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/pubaw.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/lejufekifupiluzofe.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/vakabusaludev.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/vimojefumekiditiv.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tb8nj3ji5mmkegnhi0fumiksdn/bekiwibogefeg.pdfIn PDF document text
    • http://npas.ru/pic/file/bevegud.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/92867457900.pdfIn PDF document text
    • https://suncables.co/images/file/salujulasaxeg.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/tapelub.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/93276481401.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wupeguwipiradaxemo.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/foladokesegugab.pdfIn PDF document text
    • http://polipack.ru/content/file/39001646710.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/71137795990.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210805150547_0wgutg.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98ef7c3aa---7147970948.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/rupimozifewaruses.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4e1c495fb7d098863d50f69477330588/6918285216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fraleigh+abstract+algebra+solutionsPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 19260 bytes
SHA-256: 8c0532fdad896c69e63fa7723d65981f2eabbf42533d9b94bbb8220ca9a97dd4
font_02_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 10724 bytes
SHA-256: 38670b6f218bd899d72debfcee2c8e837a8156366b6da4d4d9d668ed86ad5fac

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