Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4796ded86db190…

MALICIOUS

PDF

88.4 KB Created: 2021-07-26 09:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3eb37d6ed1eaa421ff3b31d0c1936ef SHA-1: 63688b21219da8fbb35addbaa28a394da227ec1b SHA-256: bc4796ded86db190456a1dc9942f7dd9bcb1a1c35a9d104f2128bd270839d5ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable hosting sites, many of which are compromised WordPress uploads, suggesting an attempt to distribute further malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • 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.
  • 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://mywymc.com/userfiles/file/45880680019.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nblbrf2jeqripj2s58neh2ognq/65918363397.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81a03bf82---jelusudozujuk.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8p8aet467ihmqbooj0ctj39r26/kegul.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/9705007643.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/wepubalabofiwizugu.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/85e37f2e59f3968b9f2ea1ebb894de35/danup.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/soraz.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kg9pg19tr8ea0p7bs0lbmjd43q/vitisoxosisujimoxolago.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e6f4b547---83837553336.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e7ee17c8bafcfa629352fcad42324282/59200042692.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210630004345.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/476p2pk6486meg05220qgdgbd6/xovozuzekepaposiju.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607150e350992---3980509650.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/26295908257.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cf59f1429386fd94438c966e54a38c25/vubozit.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/jenibigemugojinibalo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796549a1df2---pewivenasero.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/lemutalekumimesisazudix.pdfIn PDF document text
    • http://darec.sk/files/files/sibusa.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a950a9629a2---26139036302.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/59590639062.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/38jtu74s49k4gt2lt6301qg2jb/45031000924.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/xaritunobuputinax.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/besuxim.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/17147230405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=naruto+ultimate+ninja+impact+iso+file+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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 17160 bytes
SHA-256: 0c1c370e734134357d0a1c75bcc8b25ae8fc8ecca4ccdc870392e8a4aff5a0f1
font_01_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 11076 bytes
SHA-256: abef7fb70fdb6786b472ff018cc3c5e361e2ff726fa24beb36d12ab172ad6a20
font_02_sfnt_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1