Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec067b8900ea501a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-18 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6fa7590d3325167cc40e0e1c3e77a13 SHA-1: 577c427bb9c4f167d7d7527e33771227c470fafb SHA-256: ec067b8900ea501af412faceee42eb87361bd276a856e0ad849eecc3ffb2f776
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript and numerous external links. The heuristics indicate it's an image-only lure designed to trick users into clicking, with many links pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection or further malicious actions. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acp-luxusingatlanok.hu/ckfinder/userfiles/files/jumajukesabefasafa.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/ronuguxulijilaxinara.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/majulifitesixilu.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/tojet.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/67976912071.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/nuwatenedozega.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/l5qp3f6khmlg7qpd2g1dimnj31/dodaxizodudekore.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210915194802.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/95824028504.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a4873b01ebe96f5f9e129c5fa42d98c1/1772026361.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/sifonobexuwelezunizuwupi.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/dobakegumenavimilupuxezoz.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/81913440228.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/tizotegakipido.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/fofazebonazuxe.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/40773242047.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/89058558638.pdfIn PDF document text
    • https://sanagustin.cl/files/mivatiwavekanetevirof.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/07/file/33690432579.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/sazipiwujuza.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/losurodegufigusinazowuxir.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161450497de6cf---99476674528.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/30193983959.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/rejuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=assembly+language+for+x86+processors+7th+pdfPDF 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_off0000b0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 11836 bytes
SHA-256: d3e492c92255a748d3168f492739ed6d83c58612c652639b4088676eb5be5ccc
font_01_sfnt_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 13896 bytes
SHA-256: ad966108cd0b07b6b051878cdd95129cabc7c8892c89dfdb854480676ecf17c6
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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