Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2889b8bd2067bf…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 19:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4af99aeb55fd6999c86b9aa0b6fb7b72 SHA-1: 0bc86e0d995c5cb3d70d51c8a400704c47eb01b2 SHA-256: 3e2889b8bd2067bf8dd326d36fa52bfd7d5bc47298d8c5fd8f1bd67b5a87f4a2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://seamacros.com/upload/file/pozapibumukerafip.pdf In PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/vixawebujakizuru.pdfIn PDF document text
    • http://simoncaulkin.com/images/99676705300.pdfIn PDF document text
    • https://askflip.com/uploads/files/7266204865.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/witemiveluger.pdfIn PDF document text
    • http://pb-book.com/user_file/file/kesiremozujufi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a1a9829dd5e2af5980f0b034f5b4ccf6/kobake.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/nulonopigejere.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/99906877847.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/zukuzuvepebak.pdfIn PDF document text
    • http://mobiliteit.nu/files/lofulep.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/29462997516.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/43560961455.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bizadarudumevurus.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/suritixodo.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/81324636448.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4c3af991---37555594917.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/28942854969.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff71801a2---pakebisokajelamifeb.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/38069276527.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/18302192028.pdfIn PDF document text
    • https://hinaweb.com/upload/file/53460205727.pdfIn PDF document text
    • http://mestan.by/images/file/41292307058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+pc+gamePDF 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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 14476 bytes
SHA-256: beb0609edb260e7bc70c10e13ae814beefde2bafaf8b6bbfe37d23c87f654733
font_02_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 11172 bytes
SHA-256: 45a31cb8efeeee102b81f4755cfdd64eb2c1cc4491214ce097da4ad680ebef98