Malicious PDF — malware analysis report

Static analysis result for SHA-256 10861b9fec543237…

MALICIOUS

PDF

90.9 KB Created: 2021-07-27 17:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d6a119d694773c9db54e1934e8c38411 SHA-1: 7683a65d2cad1f8448995bd3c72b76b2970c622c SHA-256: 10861b9fec543237870bb1c6e49b8d6df657813eb2f25e03bf4c744df3826299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files disguised as software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24974f820---93433739371.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e98d801fa8---1799359047.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/taribalexaxaviba.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/volalo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c650aee4a79---texutaraxupugud.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8a0a16a04366f6ba425df40f14daa4cf/gituxizosefubosaki.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4fe8a969---3081044638.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9f7a1a5a67b80950bd4da5ef9f9a8f7b/kilusuwuke.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/54768233995.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lern6c0j5trp3b9q904ea218t7/91896885605.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/goroduxatizawi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad422733f5---24108973062.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/13651567880.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/65593f34497ed0b064e2c358ddee4964/89168938342.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/77547754095.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843367cd8c---15539342702.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec766aafb---63123232518.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/22709685110.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d67cb166e1a---43322426842.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/c6qnt9vv1g3rien8b9kij6pas1/93242610728.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/zixilutiwoguk.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/30753028007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=google+play+store+apk+download+for+android+tv+7.1.2PDF 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

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_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001132f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 17308 bytes
SHA-256: ecec982abdf5f03fc7c777cfac57900fbf161e72f8bd26d197d14814d5be1ecb
font_02_sfnt_off0001407d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407D 11360 bytes
SHA-256: 7c87fdbde0023ed9c4fe0785dd7a59049de500ad5d8e62cfa5583cf3951823f9

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