Malicious PDF — malware analysis report

Static analysis result for SHA-256 6682cfaf67eb3fa0…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 05:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9128aacd88564df7c71ac9ef60f92da5 SHA-1: 6ff345b5d714cd32ebedb8c8e1f9d708a0219a0a SHA-256: 6682cfaf67eb3fa04a531fdd0a51acaec56fab632873d7d59b26a55f631aeea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://medvor.ru/uplcv?utm_term=best+tamil+movie+download+app
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/diwodosamivuben.pdf
    • http://csc028.com/userfiles/file/20210915235557_1fm1oi.pdf
    • http://curry-box-deluxe.de/userfiles/file/57597295189.pdf
    • https://dtd.com.pk/ckfinder/userfiles/files/xiripejupasekafebowevikap.pdf
    • http://avtokapriz42.ru/userfiles/file/lagekogegataseduwubi.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/penilanexunizebinedim.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/26090954823.pdf
    • http://geoplan.su/userfiles/file/13366282572.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cb45671543151f0665532dbc4b2111b2/katadipiwu.pdf
    • http://air-ned.com/uploads/files/51356061436.pdf
    • http://dd-eng.com/files/files/devifekijexopuzupiroten.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/muriboxefiketonesagi.pdf
    • http://indianspringhomes.com/userfiles/files/raxawiraj.pdf
    • http://mixline.ru/img/lib/file/51230414430.pdf
    • http://fcraregistration.com/UploadedData/file/2102155353.pdf
    • http://hwangtosidae.com/userData/ebizro_board/file/womesewi.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/11657773837.pdf
    • https://youxsoft.com/uploads/files/38178054742.pdf
    • http://huyndaicaudien.com/upload/files/vipeliseki.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2ddf1745b2e64ccf413eae0a6255a679/gixukuvexuzema.pdf
    • http://netcentricnj.com/ckfinder/userfiles/files/67566106305.pdf
    • https://gdaniec.com/upload/files/jofenonure.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8fb9975b---35250093203.pdf
    • https://propiedades.net/ckfinder/userfiles/files/pizesibebatu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337e86ef70d---nufazesuwemomamosesexegov.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/81973828218.pdf
    • http://vit-physio.de/file/36712131615.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_off0000b478.bin
c8a269451885e775c7d49a1880bf7ec1a361efd3eb5edb2d6f23ee99b7daa450
pdf-font-stream PDF embedded font (sfnt) at offset 0xB478 10660 bytes
font_01_sfnt_off0000ccf6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF6 16792 bytes
font_02_sfnt_off0000e508.bin
c13f375dd4d95b1f8e10d2502b448bf2a772847cd26c509104e70a6d312def42
pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 14604 bytes