Malicious PDF — malware analysis report

Static analysis result for SHA-256 996ea45e902e7dcd…

MALICIOUS

PDF

94.4 KB Created: 2021-09-17 16:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 137c08f39be614a5e3bf55421136f33e SHA-1: d8855f447c5902874b1f795f0183ccf10048c382 SHA-256: 996ea45e902e7dcd701d22d1e062999ea56f3e9c13278b012e81662f7f40d996
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://infrive.ru/uplcv?utm_term=123movies+fast+%26+furious PDF link annotation
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/27957459835.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/69661634314.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bda93bb657gqn8si204s2d34t8/pelew.pdfIn PDF document text
    • http://imi.vc/upload/files/sokaxomopinejowarujitil.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/36395591714.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/fitaximuve.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a6850cbabe092a7ba3d69011e418e1e2/vuxasuzapoki.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/nunedik.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/6933735251.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16136aea12546a---fafil.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/6790850458.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/fezotew.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/60014502869.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/64804901134.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/11596859307.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/ruximuwepajetaju.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/gipoza.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/liwelumafitigemigob.pdfIn PDF document text
    • https://raljob.com/userfiles/file/67098838481.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097b0981e2---buvivavufa.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/38555593093.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109110404223506.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/nusajazisatul.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/92167889065.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/73376302300.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/roluf.pdfIn PDF document text
    • 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_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 10440 bytes
SHA-256: fafe4fd9597314b641115daedeeacc28b56f1dbf0a9f8a295dd0ca123b84816c
font_02_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 19616 bytes
SHA-256: 120148f71ea763ee7548ac57fa8afde57f94d695ee8f41e9307da81f8bb7ab45