Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfbb47f95130fc0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-08 10:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b36617ed6b7232834e2c2407a6480d4 SHA-1: e2a57bfe3265dde14ded2ace7b8359998e3c1445 SHA-256: fcfbb47f95130fc097a5f52bea6dcb3a081f5806e5f09cc51b68bbfac19f8194
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=impact+of+berlin+conference+pdf PDF link annotation
    • http://araonline.hu/uploads/file/kitabodiguwakewaga.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/91519872867.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210821124531535.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/52765875566.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135070f241fe---lekamogudasapakafobeva.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b5e95ebd879e7dba0f5d415f1b02ed14/485430613.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a90e43e43d36b7c5a5f3186ed46fc2e7/xufizelile.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/v547omsqtmf4pq1s4r7h5uso38/47862709452.pdfIn PDF document text
    • http://cmtsport.com/pliki/80623036210.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xavejowutopoxamik.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8c5e65ec6d5170d14f072bc30c79a9fe/54598856497.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/3599781972.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fd793b4ca1a---8447632731.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/07b13e560eeaff83418aa5c22b34c160/53572360516.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2df9d86e---zivomatajarepudekidi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/44874225537.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5d8b105aa570e1d248dd739afebd502b/zojovow.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/gapufizususifoxu.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/17332310116.pdfIn PDF document text
    • http://roocenter.ru/upload/file/51281974206.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/52937651225.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/45389230199.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/65416075769.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/68324702346.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157f75bbfc---62644750910.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_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 10704 bytes
SHA-256: 3ebb9e2cd9bce9bb1e0d3f08b1d930ffcd4ab46cb74b60910fba23531f3fc598
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 18532 bytes
SHA-256: bd4c4a252536667e2c6a75c4a9feeb9dc9d105e891f03d790114807fee6d2b74

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