Malicious PDF — malware analysis report

Static analysis result for SHA-256 04329d5a694e538b…

MALICIOUS

PDF

110.5 KB Created: 2021-09-05 01:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d460392f8d132038ca1569e1335dde9 SHA-1: f39983dcc6afa142c75472bb1f7e9adb65f3c907 SHA-256: 04329d5a694e538b1ec0d35313577e2d4b7714ccfee3e8c41f09e0c41f18625a
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document likely contains a phone number intended for a callback phishing or tech-support scam. Multiple URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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://slezanie.eu/userfiles/file/jixawoka.pdf In PDF document text
    • http://timavoshipsupply.it/userfiles/file/18612202159.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/zodaxowipo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8758e04bf---zadisuwipogulukegesusexud.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/967df1b1aaea3c1b0c6cc6410113e883/bozatifojata.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9a30f3612---bigoxoga.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962743bda4a---nagedoruxibifupobinuriza.pdfIn PDF document text
    • http://thedreams.cz/files/tusezelowa.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/rilolukomij.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/xufuteboxexedikamepiboje.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/puruvarivofaf.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/viwutumufowixabe.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/rideb.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rk9nmu735hnpg7hddfemf0el56/35331979288.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/zifuresezo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086d4475bd2f---vikusubudolulilexolexo.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/15774066361.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/befegegegomubowezibugo.pdfIn PDF document text
    • https://micsys.in/userfiles/file/22858258753.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/2362249250.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088713b70b1e---87876972146.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/48fd8e711dcb506e1c3b118c856b73f5/navegofanusuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wesele+wolne+lektury+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_off00014b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B01 20028 bytes
SHA-256: 4af3a43e999937d4d9989f8970813952cb0d76fbfe93f32d0d52cb01aeb28463
font_01_sfnt_off00017c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001941f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1941F 10620 bytes
SHA-256: 1fdbfdef0ad6966f0451c8d176f884de749ed5100bff1ab001b30a62044f6698

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