Malicious PDF — malware analysis report

Static analysis result for SHA-256 b213ffb6b9ef0114…

MALICIOUS

PDF

80.8 KB Created: 2021-07-17 17:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2515c3773cf8829569e21633b1b2506e SHA-1: 9841dfea7fbce98ab66e824f6c908ff101eb2d51 SHA-256: b213ffb6b9ef01146d2cfc5c465e1585043900941e2139ad8984f2fbb627c4a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of 'urgency' language further supports a phishing pretext. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/e4890e1c720a839e49e3d1bc7eb1c3dd/64482216635.pdf In PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nitvsg6s21gfe3k6kkcnmi4265/63434285864.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a449f2860---52714734921.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be11edbf9a6---22211272298.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/meraxuxepigadekuke.pdfIn PDF document text
    • https://melz-feu.ru/upload/waxugaluzepubibe.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/wologopipikij.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b045ba666b0---famobenekupimoweroj.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/gofusomisemalatal.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/gagexed.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/46283902230.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8edbc383ed0c7145cff3c9eb44d297df/wotivaxawibopuduluxerik.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/mobamokuta.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/ginujubutewu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5c511499---daxetarubipegowerob.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/30025233064.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088228e9f68e---47157613907.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/91340054858.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d632f20a2---5312719134.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/83014905032.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bcc5e5f16d25c5c2792fe8bc171f6f6a/60506521138.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/zonodevonukuma.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/4941717798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+french+whiskPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10148 bytes
SHA-256: d0ea1bf53def9f39dfc9f6905366882b724bf982a677442f7e1242b114ab37e5
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 18084 bytes
SHA-256: 02eba63a21e2545b906bcd61bed549042dc85631e23231c4d4b5374e1e4f4860
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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