Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0926b6478b0fb69…

MALICIOUS

PDF

86.9 KB Created: 2021-08-29 10:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d564f57ba37ba585814ffcb934e37fa1 SHA-1: 3a2a2a996811471752b6557a987571a78b0009ee SHA-256: c0926b6478b0fb69275160b2f679899e34c69881bc5faca5361e4895cc0d26a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites that appear to be link farms or hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or to distribute further malware. The presence of multiple external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://shatalarab-llc.net/userfiles/files/roxesejanikubukuwe.pdf In PDF document text
    • http://siripanyalamphun.com/user_img/files/62551671850.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/63788564212.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/72770667734.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b9b38f89---kojugum.pdfIn PDF document text
    • https://kawanmto.info/contents//files/nufunumiliz.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/46834911747.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/70836563594.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/losamoxebu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160795da315b2f---79865793793.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc02b7e517---43986397158.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1mipg68rlit2agn5di5j808fm4/77338386304.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/xopinisotabuvizebotokeko.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/53292027934.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66b7d9fdb---nojajaxazuvej.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/sefoririwavaki.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/89fki70r3t313vevhdl3rrtbh2/gibides.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096680d2df03---18600096729.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/11623302040.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608077dc9543a---vamakevugugow.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/sakomoxezulujivaj.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/panumulum.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/bufafanorunopinagusupozoj.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c665a03693---fajinigojuvoxalobu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vt86qh4gkte2jvsn2dgthgfevt/gaziwawotolavurilafe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e6fba8ad---95095140258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hence+in+a+sentence+commaPDF 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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 18496 bytes
SHA-256: a3a3f4a3299fc816afb8a68e8dcd8c7d5364142fa62a6b5a8ec96ffb5609223a
font_01_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AA 10236 bytes
SHA-256: 43c806c9e437ab76020fd431520d8ad6b85367d5c88d30aeb19517d8db9f1ded