Malicious PDF — malware analysis report

Static analysis result for SHA-256 5930ef70dcd5a532…

MALICIOUS

PDF

78.5 KB Created: 2021-08-02 09:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e9a6c8c37e14359b7bc70a8e923c1c83 SHA-1: fb8fb16fdec9ab662a6d44fa882eaa861655e3da SHA-256: 5930ef70dcd5a5322482bced0a997d48f9ef4d265427771972720c2da99f7303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the compromised hosting indicates an attempt to lure users into potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yer-krasnodar.ru/ckfinder/userfiles/files/15016449719.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742a139a853---wijudojubibi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc667fd02---xutifoxe.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/gobuvonajugoxox.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/jogokudusumepisix.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ilo8v0hiio2agdq10eq7b6r3bp/vozonijexo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f8fdd4875---weparozenoxixubaze.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02112f001---juxidejijukiv.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdfd99c540.pdfIn PDF document text
    • http://kleiberit.ru/files/file/44848495183.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a0b345e61d9fc2554c63d1ad6ab55da8/74083089829.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/66515117740.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/558b9634d6f7b5f80732af82beb1d74a/70954651806.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/baleterovaxe.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/puwoxixunuvek.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/90865225306.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/72335069856.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/zunoporigesunajiveboxas.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pofawosaziderovidepusolav.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/73133760514.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b83fab309---19415503066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=phone+number+to+check+drivers+license+status+ilPDF 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_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 11036 bytes
SHA-256: 7c3d97c05b06fc0fc93ac65a6131bd64f21bf73b4423dbefa8f924a02b6e60ab
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 16280 bytes
SHA-256: f30028c8f8ecae632d4f50d886188b96914da3c6842905d0702733d28008fa05

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