Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b92ba8897d50f85…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 18:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8410446413179cf62eb907a3a8305a6b SHA-1: 572ddbc65e428406965a401de755bc6eff99a2c3 SHA-256: 9b92ba8897d50f85275281bff52d3f409e8fc3d324b0d5943667dbc5dae376ff
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or credential harvesting attempt. The heuristics suggest it acts as a lure for MFA or one-time code harvesting, and potentially a callback phishing scam. Numerous URLs are embedded, many pointing to compromised or disposable hosting, likely serving as landing pages for the phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=outlook+android+not+deleting+emails
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45227348052.pdf
    • https://nonbodepsg.com/uploads/files/71059468776.pdf
    • https://dichvumayphoto.vn/webroot/img/files/52858950622.pdf
    • https://floresdeserrezuela.com/aym_image/files/35891906338.pdf
    • http://apisicul.com/userfiles/files/vutuzukimezusolujeje.pdf
    • http://khiensa.com/UserFiles/File/nomitexuduvigo.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210902_075330.pdf
    • http://elma1.ru/!upload/files/68399050575.pdf
    • https://tidymoney.com/ckfinder/userfiles/files/zagifutofelorer.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/53264905838.pdf
    • https://ibextrail.com/editor-images/53342343006.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/bolalatexirejupavufaseva.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ecca25a9e---dezasegageguwibo.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/81512626197.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145b1019fefa---7255928756.pdf
    • https://altsovmun.ru/userfiles/file/91857005091.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/qpg0fs07sn9qp7u4ek5savbrn2/8289339169.pdf
    • https://airbays.com/userfiles/file/roribafof.pdf
    • https://rizecanreklam.com/images/file/zitop.pdf
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/limotenikoroxujojerawid.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba11edeb6564d8ec142b221cd82cf955/karuvutis.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/42tlmc2f2de1v71hprq9q0oq09/35893745944.pdf
    • http://marisqueandopremios.com/campannas/file/wuvefelefope.pdf
    • http://edu-soft.ru/site/htmlimages/file/pasevenonuziditiguto.pdf
    • http://levotst.com/uploads/files/fenobarujuxer.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/fiwevixis.pdf
    • https://coebmsf.com/userfiles/file/28917372166.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6d7.bin
3faeb754674d63945e9eff10a9c689e40a5f6ae006384c0def41a6e6cf924234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 17332 bytes
font_01_sfnt_off0001040f.bin
7d82e267bf9e94e0ca084d5af77d6f917ef286f73e916af0497fc1d00d493ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 10808 bytes
font_02_sfnt_off00011cc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes

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