Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ed271f74e93245…

MALICIOUS

PDF

83.2 KB Created: 2021-10-08 12:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e867ac0c2c2151b442de1ab1962fb1bc SHA-1: 090c01f43131f4eca5f7f6ca307350f1ec9fa683 SHA-256: 99ed271f74e93245f5d3df049584b5c04fe378abf624dbc6a6924ad0d4cf9380
172 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript and multiple links to external resources. Several heuristics indicate that the PDF acts as a link farm, directing users to potentially compromised websites hosting further malicious content. The presence of embedded JavaScript and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely to deliver a phishing lure or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://juraganmonyet.com/contents/files/zegidojojugenutikew.pdf In PDF document text
    • http://donauwell.at/userfiles/file/37066239167.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/37262832121.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/33483712887.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/pubevodanugosizotisege.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/gapiwefosuxasi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb90ad2355---zugobenibaruwemilur.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/guforotovotamipuk.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88828768528.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/24604193566.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/3815867303.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0705643af4dede3ca8636a14cbf4eeea/14326804068.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9f21b128c602428240aded5048baf3d7/kebijalezana.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/62668aab87f7e3b60e3eea13293e72be/71967434350.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/83288458702.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/kipujalabe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b23ab495---75088700866.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/31030352194.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/84216541004.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xukarasogelumezunede.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/45176773904.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/putirulalewo.pdfIn PDF document text
    • http://eventechsite.com/files/files/lelifopem.pdfIn PDF document text
    • http://dostavka.markasib.ru/ckfinder/userfiles/files/87246313863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hacked+clash+of+clans+downloadPDF link annotation
    • 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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10827 18700 bytes
SHA-256: 81b402ce0aac332e0587d3b9aa51e145d4917c0b7157cdb487435b23d6756f75
font_02_sfnt_off000138fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FD 10452 bytes
SHA-256: 0628ee72171b8771cfc416f061f0575f3dd5348623de552007d19dcf3f05ea81