Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb27116de6e2623f…

MALICIOUS

PDF

96.5 KB Created: 2021-08-10 14:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e338829e2ed3ff20c8c71e87abb60027 SHA-1: 9ce0a74955596fa081154406b4511efd97580a51 SHA-256: eb27116de6e2623fb7d61f3ada4c6aa7e491812a93ed79362fc699752379e699
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The PDF's structure and the presence of these links suggest it's intended as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41bad74659---rirabopabomu.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/b8726ff97f0e2b5654bcd58a9657c362/guluputujaza.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ek2utfg9qirc6gmgbkvs2pkure/61501810012.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4c9f6cfc1dea578f6c7c751a95f28e22/24853902863.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3117f8583f4ba28441cd17d8723a2628/91090214664.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/fivojotitijovis.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6cdd77d694e82623b52195d5c291e21d/fojibizumipod.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc8f320bb---71458445679.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ef366969cb8353797a78a09878ad9180/98221973120.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba258b81e1---pazuminaliginefuwoxago.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7447ecfcbd---vomajupitijusuxegem.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fad925e2d---napoxen.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/57ffcdc590292a0fcb08b473cdf0025d/sifuxevilevefugok.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/egr7v32lq6hc7om5n9go8v7th2/bugafimodirevijebaremodam.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/nemikamoxasutowodaxij.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/88519d66a7173146853e899045299739/48868124597.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/pexiwerufanes.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/8919111902.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/245fbaea6b595f6ff8690132f2f48894/vixotidodax.pdfIn PDF document text
    • https://parc-hotel.info/file/89976745838.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/seware.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/88055521821.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/18811359073.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/suvunoxabawaberalumu.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/toruxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+tell+what+size+condoms+arePDF 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_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 10772 bytes
SHA-256: 623f811fd0eb795623da5a8378456c05a48db7d874160d3c62171987627bbae1
font_01_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 18300 bytes
SHA-256: 68fbbe7a288e378462ba0bbcc9204962eec36780f4f6e881db676da43fcd9292
font_02_sfnt_off00015c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1