Malicious PDF — malware analysis report

Static analysis result for SHA-256 904c60b9a623ffe4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 20:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75735bc8ef969c9f30d22a98b0ea18c9 SHA-1: d073869f01dd5822f1862fee23548efbd9e2b91a SHA-256: 904c60b9a623ffe460f37ff3adb488a01eaeee338fc50842338ea558ce9e55b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, utilizing an image-based design with clickable links. Multiple heuristics indicate it functions as a link farm, directing users to various compromised CMS upload locations and disposable hosting sites. The presence of external URIs and the ML classifier's high confidence score strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://huntic.ru/uplcv?utm_term=3+day+workout+split+pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d773ab3cb670034976150eba85d14668/8785815565.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608339a4cdce3---sujubewudifojov.pdf
    • http://infrabud.eu/fckpliki/file/95889312665.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3414e33e1---85245786872.pdf
    • https://congnghieptauthuyvietnam.vn/upload/files/63260613952.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bkc01820hiid3vr55kejk8n353/88679042821.pdf
    • http://cafemsoffice.com/userfiles/files/55415264414.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/d57204d908d899044c6207b59672e213/zopoboliponafoli.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774fc3af782---84071920676.pdf
    • http://hotelamadeustorino.com/userfiles/files/lewer.pdf
    • https://urbanlivin.lu/userfiles/files/54950795056.pdf
    • http://teenaramainc.org/clients/875997/File/55021354016.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/56132030419.pdf
    • http://alexlunacoach.com/img/editor/file/kaxopebogatulaxi.pdf
    • https://healthmatters.me/userfiles/file/23302468405.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad0e83793---kojiparedixezugodedofinor.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ecb0e77a5---88439858951.pdf
    • http://yotlist.com/uniformkontakt/userfiles/image/files/difureri.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf28d2314---84693047696.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/taturuxavo.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/poguvediguxumetevabopal.pdf
    • https://megalightgroup.lv/uploads/files/87768611859.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4517ebebbb---pirufusojuruxexabikuga.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/65b66461b4f1df92fccb0403e3aa8ae6/bewudivezobox.pdf
    • http://lasfyy.com/uploadfile/file/20210629005605692.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1017b484a49024f61de47489ea66994a/5048295857.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c13d59d96---24703011207.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9E 16792 bytes
font_01_sfnt_off0000d2b0.bin
afe0bfa29e74bae07e46dee45c465102de53fd5be6db1eddded8b6afcda3afcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B0 14260 bytes
font_02_sfnt_off0000f5e4.bin
4612b5e6de50d83830ee5505fcb08d0802543fa950cdd26621c23ca81e75be2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10720 bytes