Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4f86b55745ba8a…

MALICIOUS

PDF

111.3 KB Created: 2021-07-16 10:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4cfe3964e53a89c63072395f3c4a45a SHA-1: 19d9b9e42b1b8a7e6dca2ef7aab9f5a30a3f6412 SHA-256: 6a4f86b55745ba8ad920744b00b31a0bf52c30371ee27d0ec687e8ed585bd314
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://circuitoinsulargc.com/documentos/file/93635234969.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7a744c8512f0a93ad06beb0d641b8c3b/pijadomis.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbceea0c85---ronakagokonijedabuxow.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d304cf0916---fakupubexijowo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/49125086421.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090296e96db1---61489619665.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/40452160967.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050211300548.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/serexuvefoviralod.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/accb5a5dc35ccab9001dac9c9e7a5319/83865160269.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b7a8a197---nizijuwoweso.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/womigumavavabawado.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/h6qaarvsblh85u0lj85risqdhn/xobagaxux.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eir0sd35p2845699909bej1dkg/74591202877.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/10177546821.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f430843702b608a5ec695e7ee08bb044/vuziwo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kufejojo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d05aa75---laxadoposo.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92873212158.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d81af8e3---xowejexor.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10312313567.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/56296774026.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/72638361343.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/sikelez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=defy+meaning+in+arabicPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000100d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x100D6 26012 bytes
SHA-256: c816a0dc7150e28b41b26b51a5fed40347582de1a689d3c52b46467d15a3d1c0
font_01_sfnt_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 4624 bytes
SHA-256: 8b718abb5a013fd71b7780a7c4df66a3cef848ab4b28e912345e6c69e13d82de
font_02_sfnt_off00013fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 25868 bytes
SHA-256: ec351667a61042e183b967b23c0adbf46778d7bd7b6a638686a9b88665d137d8
font_03_sfnt_off00017f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F27 10504 bytes
SHA-256: 41ac90a7270820d521d0b332b0903225d8f7d0722a2da18cb1ebfa74fac0df0b
font_04_sfnt_off00019711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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