Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdfdd33f03c0902…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 23:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e4a97d6f9663673f628ae8d266300f1 SHA-1: 87abbb3bce7ca58f791af3f2de668b01dd5b2f61 SHA-256: 7fdfdd33f03c090248af34e7a160fffe201572f0538d374930254d7563d1095a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to malicious sites, potentially for phishing or to download further malware, aligning with the 'Spearphishing Attachment' initial access technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=watch+free+bollywood+movies+with+english+subtitles PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140126cacfa5---wegobuwepefalupiwig.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kadiwesuvigojipomunuvoden.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/sesofa.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/42804827175.pdfIn PDF document text
    • http://belovosushi.ru/files/17443079728.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/65206895022.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a492d14d2---tonapufenaxe.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f156912381---selekifadil.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/povugisofagede.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/83269224156.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460ea1e43fc---sewerimukefelejenamenizar.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/34572133281.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e698a32f5b---siniji.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c583a44c---43833838531.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e8664e6b6d85c0580aea8f9a6ce7b03e/zozeridimewumiruka.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/debudugalimupavovixegalo.pdfIn PDF document text
    • http://ucokampen.com/media/files/xokawalokonijorapev.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/81618103388.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/70454867928.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021091721365873499.pdfIn PDF document text
    • https://isosklo.cz/uploads/zaradiga.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614840d6dc43f---suforik.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614722d3a1ca8---98891745176.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/ruparowekakifemazagonixu.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/32888910821.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6cfe25d7---49534094268.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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 11420 bytes
SHA-256: 344bb2588b3a18e65276c748aa1607e6c03ad06c5af00c640165bb47bab50850
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219A 18144 bytes
SHA-256: bd61d8a9a17f9d651bb23fed049cdef84fdcba176c797b3b3f09247584c0996a