Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c39536726375cb…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 05:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a4bf3d2822b0ef9b4440b1144362988b SHA-1: 7509be313a5a33a16b882e9decd3bd17f554b102 SHA-256: 78c39536726375cbeca061601619900c677704860511bd2a5e25a45f6b96c00e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=operational+risk+policy+pdf PDF link annotation
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n7k6ea64h7ath8uc81f9iu8ic7/36866420711.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210510045725.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/lamelizumugabalawikaxu.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/69887172830.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/97334454079.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e5ea28c---fuxaguwivunasipevubeg.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/74026910317.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/safefimegirowexej.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/36962211421.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/tisumix.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zawufuxo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e201981b64---27363462303.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/19a7722eb3e88473217b4b8d4a0ba439/18363930148.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/afd73652824312350fe7c47ac64f8860/lavidefokojujuguroxujixuw.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/496f176be52c68689978a9ab663fd29d/8965542949.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qal6dlvvs0c66b6ahvhhgdsg2l/sazuxiraxuneje.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/23827265914.pdfIn PDF document text
    • http://evola.it/userfiles/files/pojukirajazuroruv.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/vakuzado.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/liribuvunimuwazaduza.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98374d1e5e---5703311119.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25f77d0b87---35281323777.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8C 10844 bytes
SHA-256: 3e39f140cb1d64b3cf7876b4c2fd219c1887d025f65df3c6839031f01124b96b
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 14732 bytes
SHA-256: 411f5e7e8bd7fd46c0fbf521fdea638e50b5c8fa5056da84edbcfcd276e694aa
font_02_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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