Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f779d9cc77a77c5…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 23:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1b36f1e859bc04dc251c8cb781a4969 SHA-1: 08ac23b09e02d9b44f9c9b14bfd666b23fe45d7b SHA-256: 7f779d9cc77a77c5175cf8ea13e1d243aeed8c8c8699aca39ec3179a9563a323
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://chapelguild.com/images/usr/mojowadizoredurejez.pdf In PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070200355993.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4b727bee8f0f59bc39b0fc87e2435323/35532242528.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161221c88391a9---danisezurosudiwufuju.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/74098827234.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/77036013355.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612e7a80465b8---lezuxupozumokinu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609245cf93a96---197700952.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/26066598328.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/duvutagumarada.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/77100e9eb4d3e8367f231bd900c2712e/93458104960.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83057329361.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/zimotij.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/xibezorazupakujepi.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/69900936860.pdfIn PDF document text
    • https://afayl.com/userfiles/file/fixawemure.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/67544988632.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ed01etamd5gf81l6ar8gn6da54/3429072722.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ea13295c28d6794099d5e45b9387d3fd/dekegipinusaroretatiwip.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/vutipuvovuvivi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b943dfda7---61685512504.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c33fbe0576435a390b8eac2fbb24936d/munosegel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=speaking+practice+book+pdfPDF 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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 18428 bytes
SHA-256: 60decb2f85623797ce778e5bd16b4f73773e25dd937cab2e530c1cad222e9577
font_01_sfnt_off00011b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B54 10888 bytes
SHA-256: 50afbb950d5c120b8df7ba6e8edd4b92dffa1ef24a55432731fd5d64c28e3b29
font_02_sfnt_off00013441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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