Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2cf5b3847bd40a…

MALICIOUS

PDF

119.5 KB Created: 2021-06-30 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be4f7f3ce41b15a64c353d3ee96aad6f SHA-1: 6f4f10587b5425b6721b41638deac53aaf289a42 SHA-256: 1a2cf5b3847bd40a801a8e1865f269e21b6b91fad5ea5398ba94bbcfba0567e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=fructose+in+berries PDF link annotation
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae99c532e---vuzobutagofomevare.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/18a6d1da5e97a76e4f0eca256949659c/86781893400.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/921643279bcc7a02d94e9d78244f6316/9438255348.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/telosotofusibojesite.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/dqgvovcsm063hkn2clmffkcclg/51922363379.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076d576a0c2b---roboxigabazijivik.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jikipafosa.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c041d7ca91b---32377198571.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1195ddfd6---40111810833.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/47685715069.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0h6ofrf784qrmjhil6k12hokge/33295909035.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/widonabuturuz.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/sizizifetigasimoduta.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/38445087566.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86896a6348---28363124523.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/nmu8u3qq891cf3hhblcun4hl7t/95241825410.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/11030522507.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be314861bfe---nopujadewetopogeje.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/241105466999.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6f7b7a89---sonegazev.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0153bf642---fuwimopapod.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/69312589563.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b10ab928eb---goduvijuwirumerimamovoz.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0bcf1f2b5ef0a1651825aabe833dbeed/fuzalifuborulazefufozaz.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7C 20168 bytes
SHA-256: 67f57ce72ae7096fbc5463aa6eec8770ba3eef9b6e69f036ffc18e4b0d05448e
font_01_sfnt_off0001a05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05F 10232 bytes
SHA-256: c8aa40ae46425f8c631fa50ddb98049138e437e5fef2974810bb2ce3ee07881b
font_02_sfnt_off0001b77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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