Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fe832c7cb70e82…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 04:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d96cb84ae557fc8455079f5064913a03 SHA-1: b80fe8552b865d13e8de510fcbbe476e6328db1d SHA-256: 65fe832c7cb70e824a2961e4be69f4819fd61a06ea5007e8002a4d35622ae662
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

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://psychanalyste-gard.fr/ckfinder/userfiles/files/famalugenoxabuwavot.pdf In PDF document text
    • http://cn-noah.com/uploadfile/file/lifabisatufif.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbf18246a---jamakozelizo.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/85452663605.pdfIn PDF document text
    • https://tomas-music.com/contents//files/zugajitefunokavow.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2ffddb3f1---xekelosipiripupumezazi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0gjr2d170fvksb8mgst6a7r2s2/57933352238.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a2204451332c5963171cec3d5a5e8c0d/tewumofediwopuduxobaloson.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713204452792.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b99551f3---fanegademenajexurovip.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0b1a7827d87562e405a18f55ead9b951/73521853859.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/lipodisinifesesomek.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3mtfued5arr16qktfko4l2hlb5/kemoforupowigulidibezasu.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/91215421126.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e2f6d2eb---pezefifovinovirusokara.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/81244713034.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pigekuxerenitafomodo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/45160988732.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/37258014734.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/5dbbd9047caeae530df1fb8c99670e76/modinowitanigiwafodofi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/89d9023dfb95c4242b8e1cd3940a3ab8/zumozutakolozag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=acog+guidelines+for+vbac+inductionPDF 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_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10936 bytes
SHA-256: 19b133b849707cbb3c5a19d73efec6fe231afe98c0ee4a603627ab1498fcf233
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 17548 bytes
SHA-256: dca79481bc82468ae4f889f1f7b7380c365a20233f836836dc9445855da54e03
font_02_sfnt_off00012e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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