Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cfaf6e6778bf67…

MALICIOUS

PDF

67.9 KB Created: 2021-09-11 22:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0944ec832f874426617abc79f3ba7cf SHA-1: b32f55bf5b642aae369232634fb4f879afc1686d SHA-256: 85cfaf6e6778bf672586ec4467d0970c0215c82f6790a31e537d5e37acfaf9fd
176 Risk Score

Malware Insights

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

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous links to external sites. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://igraonica.me/userfiles/file/jetegixusurisuvuf.pdf In PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xarojimugegegejejilix.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/nigalowu.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/20090056852.pdfIn PDF document text
    • https://mackbeks.com/files/file/banuwajepamipitilepin.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210909064515.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/18681765302.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f069976cff---13361311075.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7bc83694---27071172701.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/natemopab.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/1576275860.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf650cb7b9---9627954558.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/26568709613.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/48123732254.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/leremulukujotejo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/990be70f166d9baed1223530cf98ff41/wipuru.pdfIn PDF document text
    • https://emprenderem.cl/files/25077792700.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/48431010917.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/zapazelexomerazubibi.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/84059222523.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/94886550256.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/57bf15c1f4677f8d6dd82788b106bf2e/zakatugowa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0748b6324---53558771793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=view+private+instagram+no+survey+no+human+verificationPDF 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_off0000ae56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE56 13700 bytes
SHA-256: 0be656029d4ad06c9699b5ff1e98452cb455bb59b161d64d3adb18eb9b99695d
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 11216 bytes
SHA-256: c2134ec5e30e192937c9f25f897f8af68a6b4cd518e07b88ece68311336fba7c