Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b3dc2522723cca…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 04:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cbc4a1d505a53fd097112646785b0081 SHA-1: a48f3eb24e5987b296f2fecfda006807d4e88881 SHA-256: b4b3dc2522723cca35eec63d49d5c092f013c3120969bd3e617b2e0829eaedf1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of numerous external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://ketchas.ru/uplcv?utm_term=how+to+get+usb+tethering+to+work PDF link annotation
    • http://analogsys.com/uploaded/file/197868406961446b517ef61.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/ximovedobilelumerogizulav.pdfIn PDF document text
    • http://nessium.net/userfiles/file/32877971459.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/gusunad.pdfIn PDF document text
    • http://change4best.ru/upload/file/tajebizukamasobux.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/16802512055.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/43546507554.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/arsvhu8vbbrk095mcm4rd3ji4u/nuwevo.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kixegujag.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/93667646069.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/79784108905.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/736e7d3164256654c99158dce0e6aad2/nexelivopi.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/gopozuleraleluzu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/pewiruxovolodopewu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109200834123929.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210911_15AA211209F13B49.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/vupaganidegegubofoto.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/jafukidomiduzo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/66371588145.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210910_4EACD8934523D93D.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/puwokas.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613260dbc682b---vuvefol.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/fezamiba.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/96274768094.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/kemuraginopatemav.pdfIn PDF document text
    • 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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 19860 bytes
SHA-256: e1895e2c7bbe84bb8930671b111995b2a80716c9e1d4bc4f3eb90420465c57c0
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 10588 bytes
SHA-256: 7b473e4fc6c7603551f8d866ce828280e2003e4ebf5fb04d865129f619b2650d

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