Malicious PDF — malware analysis report

Static analysis result for SHA-256 8677ae5b7bef97f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 16:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab73d718c4f86b3a66d64023391e057c SHA-1: 5a21af026a106c0633ed31b1c475b7499501e406 SHA-256: 8677ae5b7bef97f0c644acf3b699a74fba3bef63bf5cee0cb5d01ac78d3e3cf5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=recherche+google+par+image+android PDF link annotation
    • https://mbamantra.com/ci/userfiles/files/34064804270.pdfIn PDF document text
    • http://datcat.vn/2018/file/vojovo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed87b90c09---51349095920.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ff69c43e119927411ad08fb9eabe8a32/22015697157.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/susinadujune.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/23062536300.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/vojowivafelonekize.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/79106805941.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/nuduvivanizadozixade.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/20078316927.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s7p7sqjf49e9iege7rjkfiemb2/91411414456.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/fuwurekoxodudokejowudo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a5ec5740---15486221713.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d565c4b4219dcb1644b756acdb2338de/19350049027.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tezudovemek.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jumor.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/muroketixazanelofaxo.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/punelakubo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3d7626cdf125589d0aab137906829da7/85730317007.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/gaxadikunegazop.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80457b96---74857472811.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/53532495958.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399203d2fb2---69837347428.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/gamiwegas.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e86baebc6c---26425862712.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_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10740 bytes
SHA-256: b687e4abd93b26b0dacdbc0226aa56b5a676fb0e6318a78d259f6a8ecc9e59eb
font_02_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 18020 bytes
SHA-256: a4a8175e9e5959235bb5d069079c2288a46e0835f9156387e538c4e561304310