Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84345b70c6534f3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 06:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a9d65dd4ba79a66d8ba1750c8d9e082 SHA-1: 3023b0f42e8059d937cbca8161e6714110598721 SHA-256: e84345b70c6534f3a7ef1356337fdaa98fd719df114f26cb66f4e03819682621
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=science+reporter+magazine+april+2018+pdf PDF link annotation
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe050088eb0---63494889079.pdfIn PDF document text
    • http://jp-cable.com/d/files/telujurabodajeku.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e20572f6---dagul.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/oom0b3fabc36m0b8d9d3b3e9r3/14782972217.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/wivubofoju.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/pevumajajatijoviwemojij.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/27209284587.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/tisefiladisarafejazijesuw.pdfIn PDF document text
    • http://isgsrl.it/images/file/rezotiwivevawajuluk.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae5da0e523---21101856565.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/ratoxajekasiritedoma.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7q4foumgj7gnufngd7gtfi9id1/62484871332.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/ririvagawinubog.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/51118743506.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8d6c3e95---zomamorigofixo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ec0b5b60814876440cffed9daf28aeaa/59185812972.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/71148988865.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1e78a04c2---bilopar.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba9d489b8---zavejabanixiliteb.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/54823470739.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c50ed06c79---83512469388.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/gedupebejedejokogojidu.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/luwavatuwepufes.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/kenatabu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57a4d4f6e---39890252253.pdfIn PDF document text
    • http://www.bandungmesin.com/file/jasorejuwosolune.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/mazesibob.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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11432 bytes
SHA-256: bea5157854c3c8ee85c729b61cd47409f0f528f3f00c02d31d39f404fc9201a7
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 18748 bytes
SHA-256: 631276ad0f5f559c88f1452bf136faffd32d1f37b0cfc46ce16af6ad9c6e6613

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