Malicious PDF — malware analysis report

Static analysis result for SHA-256 b634a5436b536034…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 12:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dbe7fba1b0fafe665410423bacadbbc SHA-1: 689298b7b857f4c32a99f0940b22713786d5742c SHA-256: b634a5436b536034b58e8276e2af2cc54dd928791672298e1cac71de982e505f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The presence of embedded JavaScript indicates an attempt to execute code, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • 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.
  • 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://zdrowejaja.com/Upload/file/pekexa.pdf In PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mikosawotil.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/32fa19f7ec4f853989f1f20dfcf6b43c/6894501108.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/41204537555.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/fazefumoseduzekilesoma.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc3eaac9d0---pabokavabumukokejusarabes.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/xatebizisobedowul.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/wewitaz.pdfIn PDF document text
    • http://xprchemical.com/upload/files/zuvawebutevipomago.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/23142065251.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210912154622_b3hpt8.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/30459584529.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/vobifafodawidaza.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/6333599003.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/66ae7c5058879a26ab24bb76e5c71366/11503967009.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/29246908399.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/pawizutaposalatuzid.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/um8tk58pfqj4973ig85hi6o6e9/fuxurakiruposeporux.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/45155872816.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/62243236520.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/50240908847.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/lenokojamevadafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+send+word+file+in+messenger+using+android+phonePDF 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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 11124 bytes
SHA-256: e8f8e7047256c2307200ca05f833ce9fe5f036066210797bc91b28223e73c1b1
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 18176 bytes
SHA-256: 53b85fe5853607ff98161ff6301282d20c1e4ed50167dba6597a8b7b567185e6
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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