Malicious PDF — malware analysis report

Static analysis result for SHA-256 02352f030c9a8b64…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 23:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 469888f7272ed4713d698d095ce7042b SHA-1: 41242f000cfd9430062973c97f743b7cc36fb415 SHA-256: 02352f030c9a8b641b3f68ed7893cbf97514af63fe856e40433c8d2fbcd56750
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing trojan by ClamAV. It also functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or facilitate further exploitation. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://vetregistr.com/ckfinder/userfiles/files/41180541454.pdf In PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/53542210842.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/dokisateme.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/73301645541.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/98429191019.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/54848141578.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/fibupevemozeladetij.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17889a7828---39217948881.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a85a710860---37110168763.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/067dc6c7e1f9c55c163657b90f1d8e83/mikupuduxikapikusuxe.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/sumegu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/92676752958.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/885c03f438fb5fcc0b4691b905ca8b9b/bijivodadudivenoxavujew.pdfIn PDF document text
    • http://alkanboya.com/files/file///56591834651.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/22646904470.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/32035057806.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/5327221109.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/82206807782.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/pukurerulete.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b62c22d5005361640240b8e2df89f5a9/juradafi.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/pesijelogoxululowajuvaja.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sizoponemoxoginomitasosu.pdfIn PDF document text
    • http://carbonelite.ru/file/35034005635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=different+protocols+in+networking+pdfPDF 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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17516 bytes
SHA-256: 1b259f0717af9e3dde0a54aefce05606191691133c1fe3aa65587f7d25378acd
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 10812 bytes
SHA-256: e3468ea6e3804753655bede3ffda8077a3abcf8d1278b3b0faef9e0159b964d0
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1