Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4bc3250b4c9454…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 09:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8aa27127ef76430ec2e4d0ccb80867ed SHA-1: 2bad5f4830a78e54643f4c46e03f8f7091358d48 SHA-256: aa4bc3250b4c945418b947017f4a5532fb4f75b79b1f3b7e9cffc1c5a5acbb06
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary goal seems to be directing users to external content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://trimix.bg/UserFiles/File/51266224196.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a2fc115d---lagogufudojo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/ladavagu.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/vuzum.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/pegelazoxezivumor.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/58740647288.pdfIn PDF document text
    • https://irantruck.ir/data/file/17047882923.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/9e74295179f74ca055d464b97d579a0a/86293751038.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe0b4f485---53270568916.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eef18bc192---38180639178.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20d65694a4---32626730130.pdfIn PDF document text
    • http://bulmarconsult.com/files/jomolejanepedogirilovo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/dugenoxunezeboki.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/xedikumimatiribalimofi.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/20691408328.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6f188a756ede7e9d4ce4a6b786c48c77/xofigirej.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/56907581300.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/27343639432.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/98680487454.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e56fdcbbad---3026097633.pdfIn PDF document text
    • https://tipresentoio.it/images/file/vusubomozut.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kibezedaburukogeraduw.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zagovax.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bf14a9c68c35985cbeee4cd56a393996/gasafokuw.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/9825335502.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/32375531367.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/91249872624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dualistic+theory+of+development+pdfPDF 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_off0000baab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 11164 bytes
SHA-256: b500fce4f4ec2327d2fd95981e4b701189d859aa8896ae5033e283ee189e9d03
font_01_sfnt_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 15128 bytes
SHA-256: 3859ef1aadb1ea210c2e7e8271738c542a8379dbee6b69aea45fad9690fb17f3
font_02_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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