Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b77d73f97348c1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 14:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5a868fb0a6e24868da48fdd305f686e SHA-1: 529fbf7933cfaa05892bc067a67088d525e75a24 SHA-256: 80b77d73f97348c1d464c8c604f121ad6f8c3ed30a6595bcf679e7c121bbad7f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the link farm nature. The primary attack pattern involves luring users through a malicious attachment to a site hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.pirkitpadangas.lt/ckfinder/userfiles/files/10168817014.pdf In PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kilurulisikiwubabobub.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/88982907676.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xisezififawonavug.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/keragilisegaleduxo.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/33089670826.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/60328389036.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/10157404982.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/47788574367.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c76ee1ee8e631463c3f3e25b7d557edb/tonetafatevit.pdfIn PDF document text
    • http://amatnieks.lv/pictures/image/besubem.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/64734425895.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/rulurajaturerodamusubalop.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914165425498731.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/83163809512.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vavapekibosalulenelevami.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/19234558096.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/65549905734.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210901_6F1E8E5324C2EDE5.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/73001389429.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf0c08ea52---tetokotegoketo.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/ziduzufewod.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/73590550540.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408149d9952---felakifopavirakove.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/57734734272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=truck+evolution+offroad+2+modPDF 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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16992 bytes
SHA-256: 004e09d16bc667d3cf6dc5a4a3dabcbb2ded5bb77d16b4a16863c02a8cf443e0
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 10808 bytes
SHA-256: c7c6878a46b74762b3b39ccee3496c553a2e9f779bf2c3224a3592b5e6cc61a8