Malicious PDF — malware analysis report

Static analysis result for SHA-256 50fb4e1f56ba56e0…

MALICIOUS

PDF

97.3 KB Created: 2021-08-26 01:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ef0fab90a368dae611b806c960ab6a0 SHA-1: 10449112e387bd182e8a6b8d100bd5b283a24227 SHA-256: 50fb4e1f56ba56e09b1f356a84511a33ce87554d636818e3418b39dc70b956c1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=guided+reading+activity+chapter+14+lesson+1+answer+key PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160afda5f4f6ca---85061903536.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vukupanarojusaxe.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/18593377920.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tiwabixasinegopi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/sugelanifaniguro.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/i1812kau9tj9m3sgo1smu72jdb/9421976204.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/faxut.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0e57d7072---1029891059.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/874790d5197fc553facb745e1468238d/61177254616.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/vosibajupibuvo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/fivasotuxirokani.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e7744adb6---putuf.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac617a68340---80418825437.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc800b504---kazoxupadat.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/felido.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/79088919836.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/lujurodipi.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/tivepuri.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/koxofafixax.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/befodazasexatatajigu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cb4562b6---xokovaxig.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/f622r6oatmi8u4fn140l5hgift/xoviwonaputafogedaja.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/nubebanexuwemexev.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d6e10956---bikigeveji.pdfIn PDF document text
    • 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_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 11420 bytes
SHA-256: bb61c32ba69051c80ac1396f57b8aebfbfebef620e31d454e32145d382aacea4
font_01_sfnt_off00012ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC9 17700 bytes
SHA-256: 9b2d630cce7732c81a794332861e01801aa8db2c359bfd1d431d34e4bbef87dc
font_02_sfnt_off00015cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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