Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efacc3b13651d12…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 20:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae26a9dfd2795344302a1b91f923c210 SHA-1: e823d3e15dbcf78fb9cd73dc8233a56cc0f86496 SHA-256: 2efacc3b13651d12ea9bd3052a3a167e630fc69048c1b298d9c244fdc06f5e09
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sua.vn/uploads/userfiles/file/3852567643.pdf In PDF document text
    • http://fzcce.com/aimgs/uload/files/54846851913.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/74870726403.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a62b94ebf---dodukisevajewemaw.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rotutulonegewoboki.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/7867089321.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/43754122140.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/13735987659.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/24899071787.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/54411086308.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/jolerufujuvalub.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/xanekogiwazowipaxomiri.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4875ee4e2---7021238989.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/43272645162.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jisaweselibodekiweka.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/foxotajitolarewom.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/14451579460.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/banigesakovejowop.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb970b38dc---ligipiforuvisifipet.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luwaxenegiwegadawadiw.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210918_124802.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/37703254267.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/47303078373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=basic+unit+of+data+storage+in+computerPDF 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_off0000b374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 17248 bytes
SHA-256: a64902af7dcc03f893d29a1a128db12839dc22d9c0e52e30b08f23afe2cfba91
font_02_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11072 bytes
SHA-256: 9ca0d85483ef54850ba72f659e1d20cec0e671584fa880ba99ee5fddb7c12cc8