Malicious PDF — malware analysis report

Static analysis result for SHA-256 42025cad3a1f7db5…

MALICIOUS

PDF

83.9 KB Created: 2021-06-28 17:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c16f66b67ce0bcc12e92dd022d29403 SHA-1: 9e5ffef9c5fd35c7bb58f6a16f5a52b44cb5ee9b SHA-256: 42025cad3a1f7db5183c69e3415eccc2d4174c843c8612ea1ac6eda1b20f2fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=monroe+county+tn+property+tax+rate
    • http://fygl.net/uploads/file/12042550532.pdf
    • https://eyetracking.pl/userfiles/file/82799595561.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/018efb13b647d0acd631b5a759a77371/18849332543.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3baf8e5913e239024cef9617f8b24ef0/ludep.pdf
    • https://adasms.fr/userfiles/file/lexipubekefug.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf48d470---niwosadomesibesuwap.pdf
    • https://blindnow.com/userfiles/file/zitinarinorowiwafidak.pdf
    • https://trimix.bg/UserFiles/File/13978503452.pdf
    • http://smflow.in/admin/uploads/file/busatosi.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb79f1514a---nuxusevezunopefuwi.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab24c7798---vakibuwebepisojixagav.pdf
    • http://taxicityplus.ru/userfiles/file/fiwowulosebozoxekan.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06031bde8---29072159265.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba4665f3c9---rotukenenekawixekujaz.pdf
    • http://associatedreclaimed.com/userfiles/files/zanexipedaregilidipokeku.pdf
    • http://wanyuantemple.tw/userfiles/file/63545712380.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9519d80b---56277349386.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c3ca1ecbf0e9af0e575c318d317fd850/tukatakanidunet.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1229f1460a7626a2698bbd7a4e71808b/kafuxugawujitezemususi.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa38ceb26---baxoxuvu.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/167fabc2dfce34d4ab1666a226f7188a/18237623476.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/guh4t259hcs45fplhd8uhq7f7u/68760024687.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2050dad11bb516ef70cbde713f0ff9e4/wirewidubivirixusibe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e742.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 16792 bytes
font_01_sfnt_off0000ff54.bin
4343c67c887d8ea83175a154187c6667caa3572a7e4ff0495561008f9025885b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 16664 bytes
font_02_sfnt_off00012a9e.bin
067f522cd49c3c93d9ebcb914ac3e1056ad959089d8d906ab87dc479bb7e6f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 10372 bytes