Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b603da0e83f226…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 21:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 145f0e2941ac24f91c3cec72c7c653d7 SHA-1: 4a42ecdfdb540d8032f21507f05b03857ba2152a SHA-256: 17b603da0e83f22671ff7dd68fbe1e70a5f77cdad1527a533984e894ecf89473
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary purpose appears to be phishing or malware distribution, leveraging a lure of 'song of solomon study guide pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=song+of+solomon+study+guide+pdf PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423e7c4fb3f---zezudiju.pdfIn PDF document text
    • https://olajpark.hu/files/files/zarexive.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/zaluvirudaxitofuzasuf.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lefup.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/gonudotida.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/viwesawipo.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/57470710080.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161430b303faf4---65008768890.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907142955879475.pdfIn PDF document text
    • https://irantruck.ir/data/file/76202635349.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/dupevasemafesevita.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/25935546396.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/dizodokote.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/sejimozopid.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/63411029450.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/zatedira.pdfIn PDF document text
    • https://casaalu.com/luutru/files/kedulalezaxudeladule.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091006252373499.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/27830808140.pdfIn PDF document text
    • http://montesantangelo.it/files/files/gomemekifuzozaxe.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/30260005421.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/keraka.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/82648421704.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4f8cc015c14c35c2324aac04ed1c5c4/vonezixisetedip.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/gikipepepipovo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f9481454895bf4ee222057fad6cd8471/sixebejowisaji.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_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 10868 bytes
SHA-256: 944f53ba4e2efa4ec7a31d69887cdcb43b3d1d2b60a77901808ebdf6040ff89b
font_02_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 18116 bytes
SHA-256: 8fe212da108dabc5652c25e588de202f0e667facdb7b2814899733aba0a23289

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