Malicious PDF — malware analysis report

Static analysis result for SHA-256 688264d4be151171…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 03:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 092b53a0b7fe6558cb9e9046fede419d SHA-1: e46d038b70b258f5b6d73c04ec501ed6a21c2d63 SHA-256: 688264d4be15117143964674df324cdd7412e73b6872d83ee42b82c15a53326f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=daily+task+worksheet+template PDF link annotation
    • https://hanoihome.net/img_duhoc/files/66810874415.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/c655182536bc921865fbcfbd81abe9f1/dujisawepixaribelisewep.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/h4q8deam74lj3h388imfstqvrl/baxodu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/menoxesafonoguladugiw.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gijokenobofamip.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160997a235f76a---javugubula.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/21b9c467352b90b37efddcf8498beec3/subikoxaliliginugop.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/juwonidiliweginimifarup.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/9465419958.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/92467049892.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab911d5edf---60169116861.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee323a0b49---xofibevirilerisuravinape.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ba5b7caa36c1def010df17d14a044db5/70975522322.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/68311970763.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905915a2cbe---wapiji.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/c980e16282f1a45699c77ce49049f1e7/19685429739.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/34360272316.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4tu49m0irsacnp857rnjqcac2o/rejurigesufavixupogiri.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/zopitij.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/bumogilolawovuto.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/begumorowozetegix.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/zunanoravimivuzepawana.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_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10704 bytes
SHA-256: 79460bb1c4be68f5ee80ca9996adb76e055ae8a35fab666f4e0449afd9104267
font_01_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 17092 bytes
SHA-256: d8581fb7182c8ff704795d6527138c4114d8b92654454499608ff4ead45665b8
font_02_sfnt_off00013257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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