Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f562fda381dc04…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 18:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 242556990ee0b51a51f2b85062295e91 SHA-1: 2ab1645ae133a9c8f8f20182be571c12e5221b25 SHA-256: 36f562fda381dc045d50cd457802372771a3aeba5e5a342e1bd3f53802ce2190
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating an attempt to deliver a malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the download or redirect to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/f7ct2h9c9kaj9m5nbrdqt6dl01/36958239464.pdf In PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3b78ef37---datadizaradarixater.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc775ecc1e---39166832541.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b94d08a8f64---xijiwuzegisotoponupeb.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/37996496624.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e2cd3d3f75bc202bcdde7c00fd509b3f/komugegige.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea48733ab1---2897977975.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160920f9a945cb---pobig.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/56485010118.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/401a6f5d8cb05fa2bb801ddf7c9ff0ea/xavolerofobexexipavotu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/89b9c16cc809959b9f603202299e256e/42704493979.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f68bd8d7cd4c574c18030a792c8af941/gawarukekepeluvosepej.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/lawederijigaso.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5764b1fe7e---41775410237.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/majetevuwezu.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/61241554923.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/supowarebulobowisaboxu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/renag.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/juvuwerepebe.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608677aee4c89---luduvet.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160faa35f296ef---widunojuvedubamimul.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/87254593581.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/32402932436.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c99839c1b1d5309e934705e61bedaac5/2043967053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fce+gold+plus+exam+maximiser+pdf+free+downloadPDF 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_off0000bd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 11132 bytes
SHA-256: ffc9b68cd98317ceefd0d5ef5da8ba6a661e0ed7b09d3781a96ff8e15f100cce
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16368 bytes
SHA-256: 7af81c8214afc327f287c8be271682aeae34175fe24eb3e88aedb135fbb7d39b

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