Malicious PDF — malware analysis report

Static analysis result for SHA-256 c290985d7d8213a7…

MALICIOUS

PDF

68.2 KB Created: 2021-09-07 13:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a4f48447e6f5ee6164201a41afb5d5a SHA-1: 8a1440c5c8a6443956dd150a51bb1bf66c90cc46 SHA-256: c290985d7d8213a7537c726f0225acff3fd2270c723b1f8c01a39e82dcdbedbe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the 'PDF_IMAGE_LURE' heuristic indicate a deceptive user interface designed to facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 68 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 http://immopolignano.lu/images/fowaren.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a69808cbc36cdbc0952713af716dc879/46127425738.pdfIn PDF document text
    • http://hzqzg.com/d/files/kazakam.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/52715697978.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc920287e2---vigofasenesisitam.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/xamagetokutazenobuxivu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/13404495635.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d28322b2---49230560370.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/dilisamafepoxujotusigiw.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/34271523351.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/6005885728.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/2368706442.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/77565653821.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ad603076247d54c01717623add9c932a/lapobekewexar.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210814014118_gk3ujc.pdfIn PDF document text
    • https://cargobull.cz/res/file/68295164689.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/xusejefivajalibomurexeda.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/50557130123.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/67544512689.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/57126377868.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/52914578882.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/pozijopaliwoneno.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/92490466368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tamil+sermon+outlines+pdf+downloadPDF 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_off0000adca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 13920 bytes
SHA-256: ecb831c0dc1902918139c40bfdeb45562e99a873999b7f03d60386f8dabd9d99
font_02_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 10808 bytes
SHA-256: 45bdb5973c6243c54b4c2a5000acf283957242010c01387f12fd78f068af91e2

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