Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5923facaf78bd1…

MALICIOUS

PDF

90.1 KB Created: 2021-09-16 15:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b957f7caee35554d436fb80425465210 SHA-1: a8b5b573839bbfdc15e49bccfce328c2915344c8 SHA-256: de5923facaf78bd1e3dd323d76f0a2df8bba8ffe5bf72556d0a42e0e5d718fc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=how+can+someone+hack+my+wifi PDF link annotation
    • http://gist.adrianlechowicz.pl/userfiles/file/tuzuramijamiworikemukowi.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/27483699391.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139110a58acf---32822108551.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414164c22fd---gotifowejedegodivakun.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/49614002860.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/71372594797.pdfIn PDF document text
    • https://premium-house.uz/images/file/lojiwedenidejijutel.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/nokabexironadukuwatitox.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_040440.pdfIn PDF document text
    • https://coil.hk/upload/files/54154928520.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/nibuvesemulujuzekosulu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1d6d7110a47696230d28c7672dbf9fa5/11486696535.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/werinituregox.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/pexawebasobofasufuk.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/33454175442.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/37512267062.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35103392467.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/16375345936.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/48647612543.pdfIn PDF document text
    • http://wych123.com/upload/files/doxofawumubuva.pdfIn PDF document text
    • https://umartravel.com/files/sexuwarezogi.pdfIn PDF document text
    • http://teresachild.com/upload/files/motobogozuxitodenulu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161337199c441a---68092998729.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/33101553474.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_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 10640 bytes
SHA-256: 2552acf53991b54c588887b4eb9cad15967e1e22fa40077ce18861ce93a44e4a
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 18932 bytes
SHA-256: 0d62b7fcdb148010603d01e2cd6b071a201d7f43d03e1447eee0447f5d60e73f
font_02_sfnt_off00014284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1