Malicious PDF — malware analysis report

Static analysis result for SHA-256 09e4a0747e30308c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 17:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86812b5d756897e0ca28b9302994b903 SHA-1: 35362d798c6a4cf034899fdc08bc34fb6f5c7367 SHA-256: 09e4a0747e30308cc6fb1a7dccebedd77873cf26ed764b4c0b2b16042ea5592f
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and a link farm pointing to various disposable hosting sites, indicating an attempt to redirect users to malicious content or downloads. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dezmaster.com/userfiles/file/92332376354.pdf In PDF document text
    • http://buyo-g.net/userfiles/file/zokudexogufadejuxexibax.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/diwenuxupegapazugemowak.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789070d5b25---jedabufikuwijixoz.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/56357930586.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/tuvakidakojo.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/sewovivoluregofowadiv.pdfIn PDF document text
    • http://candientuvibra.com/images/file/80541335415.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/sopopatixilateziwejexum.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/wekekux.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/rixokaxobopuxaguminuzif.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/55080005128.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mu28fh9245rvrf673nglkntl0c/46211395216.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/botumeja.pdfIn PDF document text
    • http://ekotronic.eu/files/file/bazupejibar.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/teborobigurumamagexonu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/20902047845.pdfIn PDF document text
    • http://wami.cc/data/files/52959697059.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/5793509544.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75ae0c531---fijukigekafip.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ljcaq15f1o7i4bmipabfiq3irk/vemajif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=medication+adherence+rating+scale+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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 10892 bytes
SHA-256: 261d4f7f38faf18a7ef49953a2917aa408f64232ef0fd7a1af90a43986756730
font_01_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 18620 bytes
SHA-256: 7744e4561d7ef2e681defec4aeb4902a5a9ec93ebdd2db37c3babe89cfb94365

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