Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92d05d9fc04c032…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e0bc76e2c5a4bfa68fa62a4494eca96d SHA-1: e0fdc4a72b6fc07dd5e9d37f44ee6abe1db57b52 SHA-256: f92d05d9fc04c032756b0009d7d062a545268a87e4bf72822e38535042234423
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://t2sc.me/userfiles/16902275196.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161255c2b68eda---84843485327.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/fa74c38739cfc875e70490265ecf9d78/bepidin.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a505a3b3ade---59836232944.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b30beea8909---91279628335.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/satukarogetatiloketuzu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/novozupo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf89bd3b4---zefanabopunozupememas.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/xasidurix.pdfIn PDF document text
    • http://parilka.by/var/upload/file/pezimorakasa.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/xukex.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/97268975595.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a333e68799f---64473506512.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/6485830744.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7e7cc17d701c1a268bc69519201cc7d2/64012218245.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/51512215464.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/zakodetaxewupimosu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/rusutupakezasu.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/27297059127.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75125ae60---kuzotobixodazevi.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/jixekibejuwovigo.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/bodixisugijezatimalok.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/369a6ef60a790298819cc73dfa90f500/99950322187.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/gifozujezizezafug.pdfIn PDF document text
    • https://brakos.it/file/gozanalojuwesu.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/76003883226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=manual+de+turismo+de+aventura+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_off0000ce01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 10820 bytes
SHA-256: 718a48eec156c174b9768fa4d148b443f7754456a3ad96d382c14231325ee532
font_01_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 19100 bytes
SHA-256: ccfc6346551d351b86770d8152e4ea8bb54394adc2f722ac8c92ac1bdc1940eb
font_02_sfnt_off000116be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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