Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b4536bac2f321d…

MALICIOUS

PDF

89.3 KB Created: 2021-07-17 15:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf317c16e848aee87e26d85838eae5a5 SHA-1: f57eff41986b3f3e78015183eaf6f1fbcd7adf0b SHA-256: 69b4536bac2f321d5417d31abd986d92883426a56463b64884ad0a9ba39aaf5b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://led7.ru/file/46384779078.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/caakprm3vnjkc5ss7qnupgrmj7/lopaw.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a057735f3323f82c5a5fc8d56cabacbb/famuwajulojixolaveju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb5c560f6f---87211497404.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21350004664.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xitigowerulod.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac5ea96bc---wewizokeze.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/16203237215.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/36149721742.pdfIn PDF document text
    • http://boxethai38.comupload/file/30800288215.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608893bb6c404---zusawoxefigukadefap.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8bc9de93e---51617900733.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/84940543026.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0edb649cf04c5bdc7693fa21e0d8cb2a/40759370578.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea8392db66---60450019368.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/1912175311.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210527005540.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f5e740b1---lopefofubadudekisotawegos.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e36d7457---8165273903.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/34196109294.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdeb950569---bogegatimarebivizipo.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/jubakavasoriwemupi.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/17035341159.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/mosazojib.pdfIn PDF document text
    • http://teraval.cz/res/file/29267382386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=is+eating+too+many+bananas+bad+for+youPDF 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_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001139a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139A 10956 bytes
SHA-256: fa499d0877a2f2548d37a61f265b6640aff09aa96eede59f00974b7c9bacf6da
font_02_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 16552 bytes
SHA-256: baebb28b6d7a116a14d87d01ab30c51d226dbc43ecae014e3acbce0cec3e31c9