Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d564dc90581c02…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 12:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15bfae765915c124518a64e019d4f1b3 SHA-1: 3f6833f97add2af7e2ea2d93b8aec3024f734ee5 SHA-256: 85d564dc90581c021611c4e8b2d6eda92b5fc7cd599e927e0fad62e7f2d285be
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' lure further suggests an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hr-serdahel.hu/images/file/betifolavakavobababilu.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908f127d630---23738930225.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4148055c12b98faec1acbe35c5492450/bozigeridozowizinolepobe.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/8199886651.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/0ts1841bet7oq33did5f7gnnmv/40431162246.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/14231952184.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fokitadija.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f9f1269d---vuborigexoba.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0440117cd0807640e72c113a80456dc6/mibusejejapilura.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/zasasu.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/vapix.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/kutedorolosubosow.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4b8aa760---zudupefudepif.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5e1f184c---18354058518.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/mutijumuse.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6556b503---14848648499.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fejorutafawegaputodiloti.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/6853690743.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/toxomop.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161150bcb5c1b0---gumimugezemiwewuv.pdfIn PDF document text
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/paguw.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07c557e7d---dewobavoxodiserivozoki.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/nazukuxafizurome.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/paxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fundamentals+of+electric+circuits+%285th+ed%29-solution.pdfPDF 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_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 17104 bytes
SHA-256: fb81384cd0f988ce75b5f4641eed014e445a090cbedffdd80708f67d3f6ec38f
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 11352 bytes
SHA-256: 25362bdc3ff92ba087f5ccd08a726e29b02618c3be588c8d57cc49d9ad09f9e0
font_02_sfnt_off00010f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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