Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c25f9032e7fe86…

MALICIOUS

PDF

94.2 KB Created: 2021-08-01 07:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed299966b8f69fafa9d54bc2b11bb497 SHA-1: 7995137d8e7f8e4549113f573c2a0169d3b71964 SHA-256: f6c25f9032e7fe868951fd00854dd2f209b0a7372840d8b61be2ef72df421ba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=schwinn+170+exercise+bike+troubleshooting PDF link annotation
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/874a3f7148ec303dcaadac6c73edd019/49718024209.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tukitibebiwuditipogedodaf.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2sd7n705mt0mrhp3875v0kj97m/mapulagugajokakajag.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/68299005111.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///belunewewivazidowokiwot.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87097500c4---juzirozesonuv.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/84486382762.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/91608446790.pdfIn PDF document text
    • https://parc-hotel.info/file/sirusirexisapafodigixo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qofvqukongstu61ohf5afdm840/jokuduruzasalipevumovolas.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/210a2dc090bc81c9409dbf1433b54729/vifetinoxowojawepa.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/tadaxodu.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/560b8b64b231d9c17eff6d89d419d036/womikujolenil.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/45967594218.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/42891094326.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/mibilaw.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/3606250224.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429382a5ff---61126640115.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/vaxisem.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/0ag8clqverqo5dn9m0k8mqna53/40455004507.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/17714098298.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/77397749068.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b0a084bdf---fixonuruvogod.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00014b97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B97 18888 bytes
SHA-256: ea43713b70001d9a5b29a09df0a43124ba339b7df905ddcd0356b4adf98babba
font_00_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 11168 bytes
SHA-256: a55d4b8d6a6e8fbdb82e4450135e1e2a3d4213f64108aa9acc91e7d7803802e7
font_01_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16796 bytes
SHA-256: b59807886b58cd1cd1a44ab9fc1bd14bf0990f26e349c0ea32f79588b92486fb
font_02_sfnt_off00013386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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