Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c12fafe61ac045…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 03:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ea8155be11485ae14caff44d9659aab SHA-1: 7ea67207ce543ed758905ebf4d574b2fa324034c SHA-256: e3c12fafe61ac0458f5e495ce549c5c185d409444c6b9525f87a8ffe39b7a0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://braveathlete.net/geektic/files/gaxamudek.pdf In PDF document text
    • http://szyoujin.com/UploadFile/file/20210917175606320.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/44794016650.pdfIn PDF document text
    • https://sudahhabis.com/contents/files/wuxuxas.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614466c1c2151---2217020770.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zijawojivojazupoxopinabu.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zimupim.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/408368695.pdfIn PDF document text
    • https://lesura.net/userfiles/file/rotekuxe.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jutetodivonomaxixovitonut.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/raraxe.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/wobadazizenawuwo.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/97431624210.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/jexozujarodop.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/lotutugikoralipetimuz.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/dokovosotulegewir.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/lezetovijo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f7f13071---wugadimup.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153976747d62---xamim.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/resifoponovofepozamedij.pdfIn PDF document text
    • https://haidangpc.com/contents/files/roxonir.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/bolotikupaf.pdfIn PDF document text
    • http://scsychem.com/upload/files/dajiforizipa.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/zejoxerutuwepimez.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210919_DF1713A55B749CD3.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/suzugixiwalesufupajila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=triplet+code+tablePDF 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_off0000b563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB563 10340 bytes
SHA-256: d91f8905fc9cb4f6d8e3fb17fda2bf1c5389bf84b64223a306c5f3ca35806737
font_01_sfnt_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 17032 bytes
SHA-256: 71ab5bf3578d287bb47607739aed0b4f29737ab862ca0dd8e1a468d94c59853b
font_02_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1