Malicious PDF — malware analysis report

Static analysis result for SHA-256 992060a721965cfe…

MALICIOUS

PDF

72.8 KB Created: 2021-09-03 04:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a819fe23d851808cebf95321f154f404 SHA-1: 51c899aa62599efcc74c8aa81a05c73683bf42b1 SHA-256: 992060a721965cfea16dac821de414c8b8016abd2f87959b2d211288e0cf6baf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://rubyyadav.com/nbloom/fckuploads/file/55951608374.pdf In PDF document text
    • https://aromamarketing.md/img/files/42776038191.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/dapupuwiwokigumex.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/4855300638.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/jizojibinajubepug.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/zenovefupodamovaje.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/21294622427.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/jitibonetijar.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/81073553247.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/41799160152.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/95502118293.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f354b820---pipekupukenokefe.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4763d66a7---72350652273.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fukubajurumekovajuri.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/zinese.pdfIn PDF document text
    • https://hgb.se/filer/file/44187040054.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/wemixujovutekov.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/pemekirinujifafetiv.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b00f0f0a---6287691291.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210808_58D43567D0FEB950.pdfIn PDF document text
    • http://change-sexy.com/files/files/77099775797.pdfIn PDF document text
    • http://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/39686572452.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2384c6af---jegipemuzuravikubu.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/11116266231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+release+station+notifierPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5C 10300 bytes
SHA-256: e1cf7a80a1adef2c2e1088bbfc98beb45c7248d756d78523f95fb090fc974651
font_01_sfnt_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 16996 bytes
SHA-256: 10765af54f25c5db8ad30beaafa0f031005f314e4e37f68d2b729564bd71153c

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