Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b8347bf258cee5…

MALICIOUS

PDF

89.4 KB Created: 2021-08-26 04:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5336cac9b4384cbeff883be12741fd1e SHA-1: a7147014c78df68e143a2d5f79ec8af6fb22f64c SHA-256: 44b8347bf258cee5a0aa395a2439fb2d1ee3f4bc4dfcc3a62f1177b21c5f1b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9738

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://sbsoftware.ro/admin/userfiles/file/44367184311.pdf In PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/teramidewetunosugivisasas.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/97345839071.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cqe118enb9d3ab9ogarbe41mpq/69079980165.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/83448542715.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/gijonezajerufedame.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/bi1pjnhhp201fu9j8pk79osk0p/jolexisebuwufetipilutu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/49339288a737005ffc00353032ba924f/44440453197.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e629eb7af4ea9dc68c2fcda7b237abdf/22675495835.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1718efe4---govimoroku.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/zugagilo.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/88034770194.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/zazujojize.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/deniwevofomugopepitesag.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dc4c5d79eb83d0dc3ece9277e76616e4/88009218071.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e35abf18---70363446642.pdfIn PDF document text
    • https://vestol.bg/files/file/75287338787.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160753442d26ae---57765608799.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/tedobajux.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/0931arfqhseabai3lcn59o9sh6/memifowagig.pdfIn PDF document text
    • https://bem-sa.com/img/file/jugowizipukaduxat.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/dewoloj.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061301153773499.pdfIn PDF document text
    • https://mavibusiness.it/file/6911646081.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/r3lcm08u731okk58u5fahj1202/pumapujojosoli.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8fe346ed701c7c317713c44c44f0a812/67457933511.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0334a7bc---85982040674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prescribed+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 17468 bytes
SHA-256: 06abd96720a8f060f14dfd35773cca1c9dc61f691b89a23fec0d136f346aad2c
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 17100 bytes
SHA-256: af6352c6d9b0e605407c38fa74e817a8d81e4c92f12c4f8e92d0996264b0d156
font_03_sfnt_off00013afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFA 10832 bytes
SHA-256: c2e54140d1542c67a562ed3fb6416cb6e0380e068c1a24567fcb8c2c402a68a8

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