Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b118aab532e621…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 19:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 585d94e21bc213a1b51e6592ae8d2bda SHA-1: bd67f380729ae02b3cf3f26d01764007912f2f21 SHA-256: d6b118aab532e621603b00255b05baf558ceb0801e707b9cc01e9e9eab4805b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress upload directories and other disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://inwebjor.ru/uplcv?utm_term=independent+variable+vs+dependent+variable+worksheet+middle+school PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160780c6f34cd7---94254912159.pdfIn PDF document text
    • https://mattress-leader.com/media/70097879671.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/saxivobozikovazevajanebe.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/85666755980.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/24486258032.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c711555437---25156390451.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/22d10a36f4423b16001dcf9db8c39df3/69958096628.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51776bb8b6---85061541731.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6e624f0e---15983844200.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/67763839751.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57fa4720e---52040176743.pdfIn PDF document text
    • http://szm.hu/userfiles/file/zirowo.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/13692576955.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609092905c8cb---famefajovevopuf.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/24726688596.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/nivitekolekadexuneja.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a21baa7c27f---34973297042.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ada4b114---85910807750.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b490199034---2874670100.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/71e008d34d43b1bc926da51b032e2f28/91610856128.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/deb9ks3k6qqjv07qdibfe7ujvj/nurofesatoniza.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ede5f95ac6c39a0ec40f0015da34240c/jilakixanizifeve.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210717_25D159C72CE47450.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a90800ae---jeven.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_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 15780 bytes
SHA-256: 46ec3e8a9eaf37997a726feeadc0f412a2f27df57c38dd7ed2adc00f2b0acf1c
font_02_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 17636 bytes
SHA-256: bbe695924f943720e651ec9561528b65d6a1e4aab90191e61d67517d9fe2a171
font_03_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 11112 bytes
SHA-256: d8d2d05cc42996e6ef37cbabec9d758effe609da340c534eff80ccff84aa67e7

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