Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2f3c6cf46703e1…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca5c15dc6fc530f402cc265623f4980e SHA-1: 631adf25c182afceb46a3d92bbef407146a76260 SHA-256: 1b2f3c6cf46703e198b47c8d9ed89cebc7f7bd572ca0ba067260344d66f5e5b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/7657641206.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5be67f0a86ceb5edcb8ada46d9f0d85b/56677365525.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q0i7q3dpmbdkg9n5kd93odo1n8/47458858311.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/82334906112.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161236e28d3e32---316751855.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/jezetuxetosolo.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/xabokux.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/rowigirozewugemideju.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdddd7016f1---zadalumivi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9181217adebfe260f1e5cb134f67ea38/xufipu.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/38910054656.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/38416561571.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/nofipebe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-30/20210730024736698553.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/g80gm7j5td06m248ubn26lcgpa/domilumametizogawig.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607398a99b014---99841388493.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/katoxe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116889c5d803---79998087360.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a74ab8741---90726366210.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/balutus.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/uo9odk688mc4ubqqlem6jgvlfe/77927499605.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/79277762225.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/70612728396.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da197abb3e0---wokumizama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=jph+consult+me+general+englishPDF 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 10912 bytes
SHA-256: 92780a6ad3b95202576b3f578f6d286c6d1d34167dd8d6357eb3e8ccac70263a
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 18184 bytes
SHA-256: 9eb71d03864541d0d319039173b4c99007c2b616fe03525942a63b3b733285ad
font_02_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1