Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8c203fd7c62aab…

MALICIOUS

PDF

120.0 KB Created: 2021-09-19 12:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65cb695055e5c06f7d08aef0208a6651 SHA-1: 4451b61de187775b437ba2f305c41ccb20445468 SHA-256: ff8c203fd7c62aab92086af3fc9f2b2212a75c0e311132d85ce02e6a03cff2e9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://medvor.ru/uplcv?utm_term=mech+arena+unlimited+money PDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bd9abe52---gogadepazaveru.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/siwinujasurupevegu.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/lixaxatezozizegofomogob.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/66296318043.pdfIn PDF document text
    • http://gptools.net/userfiles/file/midifojakim.pdfIn PDF document text
    • http://ridendo.cz/files/file/48042671285.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tezizupepimumujewutebefi.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rewerewodewilanal.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/bavijagojupovivavizo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/6739261306.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/buzerijeredikuzegopokiko.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/judemosamafufurasis.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/widupagamemofiveriw.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/26118037297.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kidisatefafopaf.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/60309629063.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/51870267145.pdfIn PDF document text
    • https://wittnebel.dk/file/duxereregopog.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zufevemotuxopasaladazofef.pdfIn PDF document text
    • http://erdbau-rauch.at/mitiwubemeneregozelovixu.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/mosikojonotelok.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/besasikizixodajikatud.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/33852725694.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919380edc3---pawuvivo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22c2c91a5---xenafib.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_off00016bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBF 20740 bytes
SHA-256: 5a04aa76b04fc269089ed3491f69fe2caebbeb97c1fa99173fa64594ebe6c1c0
font_01_sfnt_off0001a186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A186 10672 bytes
SHA-256: 03c6d2aea57662d3af2717ca52f5f10c495607a72292cfcc7d81c5d63ff67a78
font_02_sfnt_off0001b9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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