Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc29aab631d346d6…

MALICIOUS

PDF

96.9 KB Created: 2021-09-01 23:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81e0850105a7492107c77a9c8fdd03dd SHA-1: e43f5992de9a8beae444ea85ac81412bdccf4e38 SHA-256: dc29aab631d346d6d2f1093dd93e5fdedeffc7aa60086c85ae42f17349862ea9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://cihangirhotel.com/upload/ckfinder/files/wetakelobafopofijideg.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/kulapewotut.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/tisexunir.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04aca547a4---vojuxotabikik.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/sobaberi.pdfIn PDF document text
    • http://brlairport.com/images/file/45186316299.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcfa79c34---nowivokuweta.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077395e3756a---vewipetupepujuweru.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/sojekakunavawimuta.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/goduwavawuteguwogunom.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a659a6b3959---kexirosunisisuvogiz.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/mugudonibugigup.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sikibipopukugeb.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/211ecf41a50d4e758e2df80a61734f81/67683232772.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3cf8fea28611c87c79b60aa5d7bbc6df/12493762455.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/4e0beefe2cac9d402b6fc3cc868219da/12980680830.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210828_02A072D44D875904.pdfIn PDF document text
    • http://castel.lu/userfiles/files/6091882452.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/nineduwapovava.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/90036199097.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/wabubijikutunavidexokibix.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pulaxox.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f896ac8db---90891825264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=democracy+in+developing+countriesPDF 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_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 18236 bytes
SHA-256: 9ac1a98d1e92061d157d171206f516e490676bd8d6708c780dc2d6d4a6db768d
font_01_sfnt_off000143b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B4 11140 bytes
SHA-256: 15fc80c4b9312397227032b6e491ccef6ef9b75be2744c59cbe79fdb1a42bcb0
font_02_sfnt_off00015d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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