Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5221b1193b222eb…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 01:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2435f1f804177fd89e048d2d5c7ff7bc SHA-1: c81a9adeeda661513d87176e47d902d523731ea7 SHA-256: a5221b1193b222ebb5384f9c31f48bd7503a60daa027c39b81a107780cc9a790
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://teplolux72.ru/upload/file/72677670404.pdf In PDF document text
    • http://hunting.kg/userfiles/file/roboku.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/xafunakowemib.pdfIn PDF document text
    • http://chineseclothingonline.net/File/mubopeditanegevesagosi.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/xalikuvuba.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161427120c38f6---97224708328.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/28080643661.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e2701aa82---1135285933.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/57269188415.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/surupomebi.pdfIn PDF document text
    • http://mobil-tech.com/files/83686260607.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/mufamepujibopelural.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/25779409208.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9143c8e80---26077767060.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/33231327031.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tegoguvipenowefobuz.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/28593167617.pdfIn PDF document text
    • https://simorgh.it/uploads/file/tusage.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/pupijum.pdfIn PDF document text
    • http://topstec.com/d/files/bodilino.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210909105615.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mv91s2c9gvn2g9muakhke06ma4/nawiludizijedadutos.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/dononuluxudebular.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/62666154781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+unlock+note+9+without+factory+resetPDF 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_off0000cb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6D 18804 bytes
SHA-256: b6b96737cce4e4077d0320a4d4ca7d07c21c63549363f64f2feb2b3dd6675d90
font_01_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11476 10984 bytes
SHA-256: 87eb9eb81f7b5029c2966ae49d5e041b983a643a8c02ad7d67ade1d1abceeba9

Open this report in the interactive analyzer, or submit your own file for analysis.