Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31ea4f789d650e1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 00:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2171ac0aa6c3eb98fc3fcffdf5ff400 SHA-1: 8c5e42c0d3886cb2f8661154c83145f4ed21edf6 SHA-256: d31ea4f789d650e1fdc9dd8220d3e4ef21fb67afb7faac7586e34af0fa67c36a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggests it's designed to redirect users to phishing or malware-hosting pages. The primary attack pattern involves leveraging a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • 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://wastran.ru/uplcv?utm_term=how+long+can+fried+chicken+stay+in+the+fridge PDF link annotation
    • https://eijo.in/ckfinder/userfiles/files/52349324403.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/132155212660cf19b462bdb.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f5525fba---zovinaxuta.pdfIn PDF document text
    • https://activepymes.com/pub/file/kakejomitobugaxi.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/duriseduliwa.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/63032028450.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/movudolitugeb.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949cd85734c---31951510814.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16244003761013516644.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ffc23fb8---gawidilegodotumeluro.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e62cc0cac27dc8edb27c9dc515f905b6/wulutorurunebumegateke.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/dipumexunetifogibigusuvin.pdfIn PDF document text
    • http://oodow.cn/upload/file/210818094326850625fs00fu4to5hu.pdfIn PDF document text
    • https://tigaintan.com/contents//files/98905510415.pdfIn PDF document text
    • http://billsky.ee/files/file/kuwebibekiwamosexeto.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nusajivikuji.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/pilaxewulipixeturibavuz.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/silepefepeperavolumesepor.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/25549470622.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700682a198a---48282692662.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076837eb722a---pakesoparijo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/42d6239697a69644476ab558ed16bea6/84600023485.pdfIn PDF document text
    • https://ahha.az/userfiles/file/lelutigive.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/61842876122.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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 16772 bytes
SHA-256: 2d25b2a0202de87f01ce3deffc2276e263c50989f7c12d94c279c967930d075e
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 11040 bytes
SHA-256: a479f28c9179ca251d1e7c0a859d02dc615bf1a4b59ba71cca0a0e4d5c23b726
font_02_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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