Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfd6940a001ce3c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 06:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f3cf8892e681a2021edd12a4532141f SHA-1: 3389ad76104c8faf4195fee5ef33cf2996e06bb9 SHA-256: 3dfd6940a001ce3ca4e066aa36d995f47f7a62bd92ec408ea3fa5c5c8a4807b7
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various URLs, including one hosted on a compromised WordPress site, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613295284d752---juduxopog.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/20714926094.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fa9qeddhgt8qol66fnavrpd1i1/24320187734.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/sidebidilobugabob.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/12496170144.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/70769343752.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/fekimejoxuriwila.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e9da42af3b31ca6c7cddbe01e400e570/90422305046.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/36938531083.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/97676336743.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed135b3207---33048515011.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/27885288252.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/dukurirozituxaf.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/48027676531.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/27611317470.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/tuzata.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xikavelozodojuwedo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/65077761390.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/29308827957.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/61122502833.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/86949675365.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/toxowozuxife.pdfIn PDF document text
    • http://kammed.com/userfiles/file/97016304040.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/gawusel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+set+mock+location+appPDF 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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 18940 bytes
SHA-256: a8c351aa7fb24848d1db1167d72060e064e80a166e02feeb5d8f3a39d24d74c5
font_02_sfnt_off00013c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8E 10604 bytes
SHA-256: 53dff487e45cb19a024ac53edfc955e1b6b6a77d731bb389954641f1434cf7bb

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