Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e01054edb23b5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 23:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9388cf27dc798b2eb08896e467a4c205 SHA-1: 7fb398258a66594a1b4d531f154ee4dd84d64523 SHA-256: b65e01054edb23b5d3a4dfa7f0c4e2d41d004f80a36ca38d393f5001badac385
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external websites, some of which are hosted on compromised CMS platforms. One prominent URL, 'https://synerhu.ru/uplcv?utm_term=download+gta+1+apk', suggests a lure to download a game, which is a common social engineering tactic. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://synerhu.ru/uplcv?utm_term=download+gta+1+apk PDF link annotation
    • http://hoadon-dientu.net/images/files/japaminawifiwokoliwidosud.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210903113024.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///38506237822.pdfIn PDF document text
    • https://etimes.mn/uploads/files/veradisotojubibufal.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631726502.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/40059140425.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631588053_ea4325a23a.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/47802280670.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0795901b7d1440e87608cba15da44fac/bobumuxa.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/sogilutekokaginalabifi.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/dugexemutoximojuk.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/fidewapez.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/5924cff08f7d755f95b0a8451bd6abf7/19928138007.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/fased.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021091514200753.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/76546717518.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/1754267674.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/dajuzegenisupox.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/winizinufejufakid.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/3898146817.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/34481574638.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/40538350100.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_0DABFC0FE234B4A4.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/vunizugekefavogasowuzo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613213211874b---7068181408.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf10ed74b---62654656435.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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 10308 bytes
SHA-256: ca081dc499adbf713944c36fc3dd296936428b11a5bc2c1fe1691ad934d096fd
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 17952 bytes
SHA-256: cff865e0b017bd675ed0c2a8adb15ff8ab17d83038b8fa7b3d5218475a93cffc