Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb237fcb2d37753…

MALICIOUS

PDF

92.1 KB Created: 2021-09-18 01:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72951f692bdf072fb9586ba7fdb569bc SHA-1: 2cd37c78373c2727050106b8be44ca50c79122e8 SHA-256: 4fb237fcb2d377534dd40e4d514589302718ddc43049fd578e22ee0a68cdae71
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613c749f4de30---63202382145.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ff652fadce3772c54cdd2b45c8e0b4e0/42426045191.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8b0s98oph703du793aek88q6j5/7889434349.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/zikafokowetalalabunori.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/77138118299.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/33572576385.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/ledijamugiwakuwez.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/dodivok.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/rapavufaloduxagakenatigon.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/30418585655.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109161718483135.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/gelatekelogaroraru.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/l2nig9pjb85jnv1aicobforvan/95762192331.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/28920874116.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314541a0ce3---liwezuniwowakidur.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/43025589344.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/xojupilo.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/30622243875.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/91349521801.pdfIn PDF document text
    • http://iucecb.com/files/file/dupunel.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/72926589911.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/36896007060.pdfIn PDF document text
    • https://coluer.ir/documents/file/18488104576.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ola+tv+pro+10PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 10016 bytes
SHA-256: 06aa38883f17dc2e09ccdf5ba4af5f55e8ab55477274fe9c70f762441dca34ff
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 23820 bytes
SHA-256: 338c5f3a3dda578fe1a87273aa0f1035788947262c332bbde896a763fe290c25
font_03_sfnt_off00014329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 16264 bytes
SHA-256: 08ee5a58e979ef758780384e1437b2090eb40e48a6fde3dffc63de077888ae1d
font_04_sfnt_off00015922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15922 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729

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