Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3aa0202dd3a153…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 20:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65708e02383506d7d315c4e922c1777e SHA-1: 789db45cc98e47e4f0462e9f5643111b96827fdc SHA-256: aa3aa0202dd3a153e6a56f417c5056e9545b83afbd1f71ffd87b406a771ab088
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings of PDF link farms suggest the primary attack pattern is to direct users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://krisoc.ru/uplcv?utm_term=differential+geometry+and+tensor+analysis+book+pdf PDF link annotation
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d491d235---79501459739.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a972e89190a---87754484739.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab71f28c7---16868722054.pdfIn PDF document text
    • https://puppometalli.eu/file/kofajabibuke.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lesokavorupirutusesovakap.pdfIn PDF document text
    • https://limsurempat.com/contents//files/43454800565.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/89974146273.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d783e586e4f---joreg.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/rawunifuti.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/bh78lt0b0uhlg0c9fo274pgqlv/xosupop.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/73041156961.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/xejudikarifemibifet.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/52546090786.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/datoxukekijetiwane.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5c0108c1a---tevizififopizegerobotod.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xuvawukudodatemub.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/28784568824.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/84864522487.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b490e3aedf---55777836523.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160702eb5e8acd---45076519714.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/3191153748.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9340508bff45a4ab2a25016a2a8a0d40/48920933254.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c147c0cc089---83342946576.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210605015604.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tamurip.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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 18348 bytes
SHA-256: 11e82dae82b3c5cb279d7870a17149c94f08917cb3cd6b0b8059141ee046f943
font_02_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 11188 bytes
SHA-256: 6c72074c4e68f52cb2e8e104e78a044c8ad31c561f9eb2a6f9b6d14a80b33ec0

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