Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a5d83d09b85f4a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 06:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70afa5f759563b4babfedf1f0e360729 SHA-1: 9696226bfe7f404b69e16ff5c0cdc1861cd65abe SHA-256: a5a5d83d09b85f4abc785530b8596f1e5d179dc0d1e783418f3c7d9996fc6443
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, including one pointing to a raw IP address, and several to compromised WordPress sites, indicating it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://1night2day.com/ckupload/files/38136761158.pdf In PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/tawinefukonapedosovafe.pdfPDF link annotation
    • http://foxgraphics.paulsfashion.in/files/26097671933.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/filunu.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/48339846137.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/pasedobanox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4d6f83377---kimotuwadosuturaxigitaveb.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/l32g1fgs654ahqhtju1jmji9d2/4227582598.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090823060073499.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/vefubexuvotagizexi.pdfIn PDF document text
    • http://change4best.ru/upload/file/ferofagubozuzozojolivekox.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/lololubosofemeb.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/85829184798.pdfIn PDF document text
    • http://idcla.net/upload/files/vejokuz.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/raxufujipinivov.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/13a87bbd03d699da2b8e2d5b47b5f38e/pixajevame.pdfIn PDF document text
    • https://slide-bearing.com/d/files/kamitewaneragaxojapudega.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/94c1d24e416349c1f3a83dadc7fa7487/nujukowagubor.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/730326178.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/xofibinewezovu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/23356939078.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/12037002780.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/ketuko.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/10467189648.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/30398611661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ppsspp+emulator+gamesPDF 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 10500 bytes
SHA-256: 8fdde59d5e9ab70398e4e3c6f11fd587e02234c34025140aab0be3382c1226ef
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 16932 bytes
SHA-256: 3e35bc010465946b65bc630a8ffc12ab5cb7c57429eeea210a7afd0b12870df4