Malicious PDF — malware analysis report

Static analysis result for SHA-256 5514ba831e719b8b…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e38170ee276aca833f67540f2ded2f90 SHA-1: 019d5cd2f78e5e6ee7b9debe9a8183ab1cfa629b SHA-256: 5514ba831e719b8b7be802de6bc998cf24c1474e9a073a9f7879bb92d081f9a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/mobipuzadidepunuj.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4750b664ee55cef826c9acf329a79885/nekenumazerinepijubem.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c110144e4---zepasafolizosifumaf.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/19148548937.pdfIn PDF document text
    • https://ancoraeducacion.com/images/vapejipuzewapipagi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/16122913111.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/rufepeki.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0975d7a008283580838514f8ed8ef557/dojexewetovoretovo.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/16335934044.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tokavawes.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cafa47151---busumixape.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/59988050782.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62d153abc---26520290078.pdfIn PDF document text
    • http://tencanpowder.com/d/files/sosoxofonudof.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/wutojudo.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210617205351_fywzp0.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/dipalinumeruxiji.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/liweriziwutamen.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/xorumisukivunixiwisizit.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071369b21fa1---zavepu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/35800946713.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea2bd2a28---sinijone.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbce99497cc---dutiber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=using+possessive+adjectives+worksheet+spanishPDF 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 11128 bytes
SHA-256: 00ebbaa5d7bc825f480f4527adf032c442c318bf222af2cf5efeee621e8b73fa
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 19548 bytes
SHA-256: b3b2661eb1abee4c4de5c143f519959ae96056bc82a50cfa549dca519a7c51a8
font_02_sfnt_off000132df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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