Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abf1dea2bcbd2d2…

MALICIOUS

PDF

84.1 KB Created: 2021-08-18 15:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91e69126bf2607bc5589ce8d6804fc3a SHA-1: c572809ba5bfc0316ab7149e2bfcb39ebced9a03 SHA-256: 8abf1dea2bcbd2d204f516d429005d3018fc6fb0b35661721908053615af118e
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to potentially compromised or malicious websites. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security controls by encrypting a payload that would typically be revealed after user interaction or by providing a password.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://groupunsur1.com/contents//files/vijapisopotezelumugul.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf89a2ad4e---64001474447.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/10971927255.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/35866039944.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16086939252fd2---63898940464.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7989bf5ee4c605a8bdab997d33ca14d0/rowajipudisax.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/25312090546.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/pidotupiluwobewuvurejor.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/33344664542.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/mirevunidaniwokunuju.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/af76d094a7327cdabac92c28709b3a91/24231746740.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/xirinokusenidanije.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/1039092832.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d64eceb0a---poduvuzobixoxevija.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffea8f9a6---kafuginakudibudojoxu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d229cf120---kebojexelunodelosaw.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/33842611573.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/ranozobofesokogasebor.pdfIn PDF document text
    • http://centronegozi.com/public/53101705525.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/bemisolo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/lamijufataguxarolukezezuz.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8f7b9105304357d349f25821f4f67efe/4430137259.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/okm35589uk6k6bkunu46gt4lqi/dirabefafenozevonon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D1%8B+%D0%BF%D0%BE+%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%BE%D0%BC%D1%83+%D1%8F%D0%B7%D1%8B%D0%BA%D1%83+3+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%88%D0%BA%D0%BE%D0%BB%D0%B0+%D1%80%D0%BE%D1%81%D1%81%D0%B8%D0%B8PDF 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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 11672 bytes
SHA-256: 05e873a51ba54393d67e68839afee7f4eee581a37f3ab264031633e50d69b700
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 21648 bytes
SHA-256: 14f77b7602e723c700949ea905a82035ce156384dc80d31d0a98a6c3cc95abcd

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