Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef33c0716c734841…

MALICIOUS

PDF

91.5 KB Created: 2021-09-03 18:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdaa132d235d1dc1630858f016dfe28c SHA-1: bc01be616b634c53a36e30a763327581e114c770 SHA-256: ef33c0716c7348419f24444b9b4520ab27fb1732d5892ca33761f16d8ba410a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The presence of a 'download button' heuristic suggests a lure to entice users to click on these links. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://egyseg.eu/ckfinder/userfiles/files/24978546351.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0202184d206fdfa054af52571a0e5828/15940377440.pdfIn PDF document text
    • https://aashianarealty.com/file/6939272213.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/6244636618.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/sofipafevinodona.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b606971b85---11711027785.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/juwubujolorefufosa.pdfIn PDF document text
    • http://hnspkjx.com/d/files/lugarafexakosuje.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/fegirude.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/geboduto.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6ijmmvribqmg4f6e5beogjap2c/lulagaxiwidejaluz.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7s9d61t2rud1erpvvpe90iuc5q/pulisaxan.pdfIn PDF document text
    • https://preciseenergygroup.com/media/73102550464.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/44529259118.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/11369726812.pdfIn PDF document text
    • https://tch.lu/files/files/debal.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/45251396481.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b7c5b5f2f---rirekamigubidawezofa.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021080615053473499.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/rexitoxivesokijuloxasas.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/19599448925.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/pudogitabudopu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01b3c01c66---73365033617.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdfIn PDF document text
    • http://geose.ru/userfiles/file/66974356831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quran+pak+with+urdu+translation+taj+company+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 19428 bytes
SHA-256: 517ee61c6a1e5e43cefbb554d69aeb11c2ab44acdb6507daadcdbf1e8a75ee19
font_01_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 11464 bytes
SHA-256: 4dd1e02325c28b078c614ea62323d59fad7bf03cacde24483698d77cf67352e5

Open this report in the interactive analyzer, or submit your own file for analysis.