Malicious PDF — malware analysis report

Static analysis result for SHA-256 6abba09e8098baf1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 10:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f4f69fbfa83bdf32f9b502129a94e69 SHA-1: 238892aa2e166983b2884a7fa17da70abb56d9f9 SHA-256: 6abba09e8098baf1e43dd1feef3798c875695386ee9a613036741ec4ac4e9e79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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=download+audio+from+reels
    • https://ekransamara.ru/files/dekivugazifavov.pdf
    • http://peknanevesta.sk/media/file/74447566941.pdf
    • http://nicolalazzarotto.com/userfiles/files/60364711242.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/nidetozoposiv.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210908_7A05B45322F48539.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071de9f2---33691848802.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wajoxo.pdf
    • http://dichvutot99.com/webroot/img/files/62231708359.pdf
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/matarurulekopis.pdf
    • http://hyswimpool.com/userfiles/piguvejukenirabimunalib.pdf
    • https://cordovajewelry.com/images/file/dapap.pdf
    • http://kramnyca.info/img/upload/editor/file/72040660.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/23711819456.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/42526039433.pdf
    • http://agierresrl.it/userfiles/files/loxezoxibujawipawi.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336a9fd3d7b---papibujureditij.pdf
    • http://edukoc.net/userData/ebizro_board/file/84571147419.pdf
    • http://pokebarslo.com/uploads/files/63300774859.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613559cccf84f---medopiguxigazigapijeva.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c623431e87---dozapuzubijudewusiw.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/77920965420.pdf
    • http://eca.or.th/ckfinder/userfiles/files/nafisoliri.pdf
    • https://artbynela.com/uploads/file/42256043763.pdf
    • http://apex-architect.ru/images/file/wenibomojomujadux.pdf
    • http://henzefashion.com/userfiles/file/96897317317.pdf
    • http://geodavidepini.it/userfiles/files/17355417272.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_off0000d15b.bin
90affb03b089dd29e5965cfdee67ae5f85cd5cc6ff1a09625d217b4cb8d0074a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 17828 bytes
font_01_sfnt_off0000ff59.bin
22fa38204239dd50a0f30f773173c6ff39926595fc2e0fcbc054d7512b3f14da
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10604 bytes
font_02_sfnt_off00011795.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11795 16792 bytes