Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b1b4808dae025…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 02:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 04c96904f097dcd4fa047ce6105097b2 SHA-1: 0cf569eae5a2998e3d926489464b8064b2f2d0a0 SHA-256: bd4b1b4808dae025dbade07a4a25d3b32a3c0233307ad49eab5489f2fb9bf305
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • 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://bjsddesign.com/filespath/files/20210903162930.pdf In PDF document text
    • http://eptesteplelek.com/uploads/file/24496748570.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/vuxukunuxis.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/45577487701.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/tujorememugidu.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/muwugejubupabibidig.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/68241645604.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/1025711699.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/ragugabuxo.pdfIn PDF document text
    • https://onlinendttraining.net/files/73906783882.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/josupubeziba.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/senuzugemizotejedig.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xebiwe.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/78567430097.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/pajibuvipodatibufeji.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327d5f894ed---sanikepupov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea2b9447f---weboj.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/ridezenejukixadipagapi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136093b38072---menitemosorezibegelirasu.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nipuzaxakajafegabuda.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/7030988835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multiple+accounts+on+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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 17800 bytes
SHA-256: 475ffdbe3cb3f213a6dacdd599a951a2c25476bf12ae226f949e84b2e04ccb91
font_02_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 10600 bytes
SHA-256: a76027c2536577e1990d01ac5e657fff4ce8cd7f85dd2626de3eec9990651c76

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