Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b13bc55a49d2e6…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 06:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 029846f7acde86bca551fd351c3567ee SHA-1: 41d20adb7c9734afbde13e3410b19f978f3b1657 SHA-256: e5b13bc55a49d2e68ffd8c7a3952baf91b0ec201be8346faddc12fe36a9ce114
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download game' lure in one of the URLs indicates a phishing or social engineering attempt. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tythb.cn/uploadfile/files/jakigisedenodafawi.pdf In PDF document text
    • https://kurishupally.org/userfiles/file/76306457339.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wagumikebonu.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/12922611555.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/27194105956.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retawuzafodija.pdfIn PDF document text
    • http://grafitym.kz/files/file/38281320196.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae2f3f3d87---bokafawozewejimujabivin.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/4528007687.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/zovitetebovo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/43581290049.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffde22a75---99214749336.pdfIn PDF document text
    • http://co-mit.com/uploads/files/97333436774.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/92366619965.pdfIn PDF document text
    • http://pay2pay.net/upload/file/lagidebofewojoxuzifeguxo.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/duguruliwofojasamagoje.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/91160823296.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f746ee5031---fibasurofajanegika.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/daniluz.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/puzowube.pdfIn PDF document text
    • http://esen.life/userfiles/file/susegite.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091215503773499.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/32423116939.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28888408904.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilotol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+game+batman+the+dark+knight+rises+androidPDF 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_off0000c3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C8 17068 bytes
SHA-256: 74927f50e72ae70583566f89aa52962413dcc96430058022fea0580cf0b3e7e1
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 11012 bytes
SHA-256: 4267e2a358e207c6502a51504d03df2ba153ed98443b5b7fb18ab078a37cae95

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