Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2ac5f07d31f8ac…

MALICIOUS

PDF

97.1 KB Created: 2021-06-29 01:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: defbf61266863e6060c6e23cd01524db SHA-1: 47257be8359d643d6e4a2d09341de055410a3b68 SHA-256: dc2ac5f07d31f8aceb2244d6b473d21cacccf30540dc6bb35ae4c542056457e4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the presence of multiple links to potentially compromised sites suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5b06b2e84221af7f046495dcb9538703/pazilogafuvus.pdf In PDF document text
    • http://uamarkets.com/images/file/kiremexe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa546af72---votidedajetunaxima.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75f6f05fc---katakamaxelowamuge.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084374e27f07---22270210800.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/94269b44ef4919dcb822e5c34915f96e/72673861754.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67d29e79b3---sosujawurolobegefitivus.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/e80b5cf620be36d9571f0503dbab315b/24436924751.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/5715512306.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a2b9814c0---peziwopiwemu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05a24b80d---natelewevonigapedivix.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/gokafokegoduduta.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb128737a---84754395729.pdfIn PDF document text
    • http://boxethai38.comupload/file/pudob.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/de9de22f664a04a8cf1c39a83f59d08c/94084480727.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/79564537287.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/63393908771.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a7ce5206---lamasupuv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad395bd44f---fuvozoxoda.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a9e5c362---93777361620.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d00bd70ee2f---tawepajejabumupate.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acca641b0ed---6659811511.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f937e760---golininisaxafoka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160880571f0283---2267801764.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/680345948ff16bad299914d447cfc754/wekis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=another+word+for+inherentPDF 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_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 17496 bytes
SHA-256: 7f76b032f79dcbb32113765de0a4f83af05f81a17f73fea7aac7986115fa10a3
font_01_sfnt_off00014716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2D 10140 bytes
SHA-256: 7fb22e9c445c4a44ff13d50876c6e15c0285e6dab32dbf41bacfe1d1bfd78d5e

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