Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4346e7f44c9b5f1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 22:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 916135c7e3d30a9ff782db5849a2298b SHA-1: f72de142b4c0dfcb17c2d1e022846298cafa8b1f SHA-256: e4346e7f44c9b5f115b1b931a47809f066fd7214cf30e7bfda1dab94da57d608
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit user trust via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161428724cd970---lezolizol.pdf In PDF document text
    • https://stalbeckers.nl/userfiles/image/file/39457476150.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/gijajixenugirokesajusako.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/24576210324.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/52065935359.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/83919684585.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/simakurofir.pdfIn PDF document text
    • http://abnicum.com/files/file/36343628152.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/bepemiwidule.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/53094304463.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/xibemimero.pdfIn PDF document text
    • http://ipceurope.com/assets/file/sixuzazew.pdfIn PDF document text
    • http://jar-ted.pl/file/78510311192.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3462e65964b25ffbd70998ac6647ae58/wesotokutikunuzedogaf.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_5670560B5C57E763.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006e335643---boropizek.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kepemonedaliwibabalowosuz.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/6046674379.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/70612682690.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/wapabugofomudomur.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3590591c7---42609731705.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/61472166531.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613462f923bfc---baduvemisipovor.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161323a8fabf5d---kivanibet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tor+browser+android+apkPDF 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10520 bytes
SHA-256: eb5c8de48f388dccdb1994246918199f40b59e96a495aeecc48fc8f041b30481
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 17532 bytes
SHA-256: 0bf9c82fcae2c87984b4dad8025b667195892f806fff1d3ad62af5540e7e4c04

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