Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb20c850bc6ab82…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 04:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd25a4dd2b70f5fda95a4f069269ed20 SHA-1: 437475e3b277eff3ac039f2e21192215297796ac SHA-256: bcb20c850bc6ab82d35ed6ea85a7657080a5674730b207183b54b4919d167668
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings clearly point to a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://modellszerviz.hu/userfiles/file/lewexita.pdf In PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c63809e298b72cf49f7140bfd77d6183/55976090045.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a16547c1---momezawoxavopolod.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/77183105123.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/37442747930.pdfIn PDF document text
    • http://topas.lt/userfiles/file/faxeg.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/74772315703.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/tiwunabov.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/25275481951.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sizabosuv.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea05d53e2---wibilade.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a8701f63---20086192948.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/44474814389.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/11535466417.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/65dppk6ca2bish7ihsv0undp54/gukerakebuxitadasiworose.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/94521174148.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138492ac5560---32541217500.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/1609089469.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/81637666245.pdfIn PDF document text
    • http://airmon.hu/images/files/rudejuvoz.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/11158578386.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/pojitisubibuvut.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gaxulozemelirujurawosovo.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/86904539998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=blossoms+of+the+savannah+chapter+one+questionsPDF 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_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 18364 bytes
SHA-256: ebaf8c80171015df0c9d63cf44075ca9b921b5b97aea11880a671379837ccb19
font_01_sfnt_off00010d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 11112 bytes
SHA-256: 7d6b142d6ce082c0a36cb3256aae339ca184c33a4de99fcfac8b44d3c94ae526
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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