Malicious PDF — malware analysis report

Static analysis result for SHA-256 7582438bb8b6bf16…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 04:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f900ab72b69fde768f3465f64c95e78 SHA-1: 4911d517afcc72bc6ae5cd99f3d6a9135a1e94d3 SHA-256: 7582438bb8b6bf16b354f43ea4c4d99a40a444c4ec17919dd5de03aa7b5f585c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=mp3+download+apk+android', likely serve as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=mp3+download+apk+android PDF link annotation
    • http://gt-outillages.fr/ressource/site-image/files/sozitimora.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/figaxisotikudedow.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140517f1d456---zuzegulezibir.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86d7463dc---kuruxof.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/mejog.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-12-33-47-79.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/28584144661.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kevulunupudujedezul.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/losigakokekolo.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87110811251.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/sikofupuraxilesipipon.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/34070308104.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/bobiposawamuvagijeropa.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/kokinox.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/34844725516.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jilumesuvatutup.pdfIn PDF document text
    • http://vaynhe.com/upload/files/15892224024.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/kebulep.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/73083351120.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/genafatuxirasig.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/19594703547.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a8b2ccabdca012d215c62e81a8f83d62/guretapelazolaw.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/pedipiwizikijusidi.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/22596654767.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e1c070d93eeae768b7cd3f69137cee41/55842893448.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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 17732 bytes
SHA-256: fc178de00078ebb1ae68e4212c6e404ae22aeff27242ec5e2efdd0547b486915
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 10332 bytes
SHA-256: 1b94ae31a23962175333afef752ee9fafad5ee3b202c1d5a798616091fca2e07