Malicious PDF — malware analysis report

Static analysis result for SHA-256 9134859bcd2a09ae…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 10:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 71aa4cf51d109a11f274822066fa239d SHA-1: d0738b531a4bdd34499cf495ad68174199d9b81b SHA-256: 9134859bcd2a09aea7ba1eb96d5a2f24b077c00fe73fae8412b7d763e1f4d0ff
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories. Heuristics indicate a link farm and a deceptive download button, suggesting the file is designed to trick users into downloading a malicious payload. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://villa-carlshorst.de/sites/default/files/file/mafarefafeparurefujofa.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6752f817---gonuluxejilopitedugaxinip.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a772969fbd7---vagisudujofasifavakege.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/78fef0da38c0c6ef584c2b6fe28af220/7874436225.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/rodosezuxuguxaxukujopi.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/sekijebilurevigorime.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c1d5c928af8d4ed436d1ed1af944d20a/sujubobelamuxepefura.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/movivoguseredepevaro.pdfIn PDF document text
    • http://allycatering.com/userfiles/50393162766.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zefabejisa.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/d44a04b949eb7e7509b8e2c1e7ebb17d/15230935319.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xomibisujewebux.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f67893d93---91813814469.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/b4l8pudviq65oeonvd9sv33776/kumegerezoresar.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/levujigobago.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160844acb9d589---vititiwozopepamapotoga.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/65079463186.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/volagerupis.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/fazedeneviru.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tnoul87i33iv5gebe7454hv3c5/21033533923.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/debotofigitafinukagite.pdfIn PDF document text
    • https://cncunse.com/d/files/sasisusov.pdfIn PDF document text
    • https://fobh.net/userfiles/files/wawewerexigal.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/89715644981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grama+sachivalayam+syllabus+in+telugu+pdf+downloadPDF 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_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 11612 bytes
SHA-256: 4806763c78612ee6b06c50c021e85641cc15ca236f0232f695a2ad6747372a89
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 17156 bytes
SHA-256: ecd4d32026c5921c4352ffcba24d69f19b5c96b36dfcb7ed7eac0e5341574f5c
font_02_sfnt_off00012504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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