Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d8891879696b39…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 05:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 241ac001c8622f9317dfcf7358db848e SHA-1: ed019e0f3c7c1b3b0fa4bf7c2ed1edc36b771988 SHA-256: b7d8891879696b39c8d13a5559da53c7e51d4b40621015966389b238c679dab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of multiple external URIs and compromised CMS upload links strongly suggests an intent to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://queure.ru/uplcv?utm_term=meaning+of+wandering+in+tamil PDF link annotation
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/72e90889ceff025d55d6af844120b8d9/47353242780.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c0415751---zaterolufijepovosigisok.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e17e659c975---74749524246.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9e9cfd67d4ede866b7e36d740efd79b8/folujabuxuboxisesoripa.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc9be2c10---30362138595.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfd87f655---kikijanakabesebupewerev.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9f2ff29487e981e464c6c43e355d011/25203159661.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/74400221663b89e735c03b02cdb9a2f3/82269995378.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fmk6ea4n798pighpooe02a8k4o/16294893623.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5af493e170404362def452ee62746215/kawinilonelebawutatala.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/52ab54ebf4569f1165819c70dbefaacf/diboxemir.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7714cad234f66931bfad9e34a9334ae9/10782361122.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35a06ea4c---74889515480.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3rt67k349v3jacl9r472ircq3r/wekebesorupibad.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/12142698079.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71eef2c88d---73865933052.pdfIn PDF document text
    • https://aristonails.com/articles_files/files/zubip.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/zidujen.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af2b6849f5f131624f91eaf9423bb0b8/mifitadajazubo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d63893934da---purejaxoxutebivenefe.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/93792690843.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ff00a3b7b182e2aad5e510ecc6eae4af/jukobulapewo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/tozexibagajafevafitisugum.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cbd9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCBD9 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10608 bytes
SHA-256: ba76d1ec165dc4c215b240208b9d86c78244d6539f6a1d38fd0f4c4bbc74325d
font_02_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 22864 bytes
SHA-256: 6417d9ed2a23727fffbcca3d8a8ea260563d89be5ae98c91a827caa82d5bed18
font_03_sfnt_off0001396d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off000146ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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