Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ad87a00c45f872…

MALICIOUS

PDF

95.4 KB Created: 2021-06-27 23:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26d3306957db3951758001ec37fa1d3b SHA-1: 57e0fc11ac0f51497a12e5b5b2eb534fb83f04f1 SHA-256: c8ad87a00c45f872f50860bafcc0d985d7590d753b9c97f6788552e0757ba727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially harmful content, consistent with phishing or malware distribution tactics. No scripts were extracted, but the extensive use of external links suggests an attempt to lure users away from the document to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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=free+download+live+net+tv PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/149fe428ae570a443a2779410dac5d4a/37717247406.pdfIn PDF document text
    • http://jump360.co/upload/files/20210614082902.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3407a77d3---37552531793.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76c3835b2---75511166697.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36cf83f9e8---lodofugoribod.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sagigetopimubebe.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zovugusotawuduvepo.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/64898314074.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/debusonagebeduto.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/luwapamezorote.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/99705981513.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/61045024258.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/84182609073.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a31107a1e---tilalamujaxe.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609096df6491e---20958769316.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4d5e89978---9887708825.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1e707a2a622273fbe409199e989a5406/93287328195.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb3586f0f---45986758676.pdfIn PDF document text
    • https://hssanesteban.cl/files/gejomejuni.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///82350647917.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/nnil69ih5vblqplr3pkcc3a968/balabasi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6fd73afc93d4487b9f0b2ab3348c8746/67914599947.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/78643733392.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e54926657dc1902b3bf45e1fa56919cc/zuxufupabumolepewelosete.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00012b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B66 17504 bytes
SHA-256: 91dfdaf0da4069e266241f1373ad9301ca3859330e6548c28f2b2d5ef3956343
font_03_sfnt_off000158e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E1 10204 bytes
SHA-256: 3ef4c2a7b26c6d5e91bf803ab5264c763355fbcd41b0a76a7a04a19f37fbb2ba

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