Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d350a2028144ce9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 15:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 82051fb6e2260d83d09240ff8f200a41 SHA-1: 00feb59ba91fd70d082c6167d502b7948eb74899 SHA-256: 4d350a2028144ce968e9c1edd284529c96c8f925947ba82026d7ec30f3fcff15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=the+gilgamesh+epic+pdf PDF link annotation
    • http://zezoalza.com/ckupload/files/43048853303.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a276208d68633a11af85f50e93bf8004/poziriwesamuritemowupeka.pdfIn PDF document text
    • http://artospace.com/pics/file/15857797735.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/juwuvizomemisenel.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/39580305131.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/2133153867.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b63288294---jowutolotina.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/7lnjh5tkegi59qcpgtm6a1m1mm/66993755263.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/54274920432.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161149ed55a46c---76169780812.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ilnt4v4faegbuqn86cj3r4sbk3/16127584510.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/voraduzapetoz.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g14qtio66i7uonosl7k74dm1h1/torenomukuwaraxixel.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/10812754909.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7d2cf8d43d8ef646c6ded9e4c65e6cd6/lenupakuxazutoxananepowap.pdfIn PDF document text
    • http://aimic.com/userfiles/file/dexefadaxapadimezadojir.pdfIn PDF document text
    • https://stopserv.ru/files/file/jejojod.pdfIn PDF document text
    • http://cartopack.com/Images/file/manuvitunuj.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/26275220663.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3f7a82f83fea5ae4eb45d4fd625e23cb/60454357346.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/46742868216.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/mupawigunekakukefut.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610993afb9be9---kajogajezi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 17900 bytes
SHA-256: 9f67d7560f5f6e5015dd4dd6622676365dfaf64702aba74a4425bb21011a8417
font_02_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10608 bytes
SHA-256: 00c915c07e669f9a69247aa4c54d7a2bb3626ee667a5b433fe127721f8bb532a

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