Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dfd63f68d40117…

MALICIOUS

PDF

124.1 KB Created: 2021-09-01 23:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: beadf64cf19ba9fa82189ac75db4ba26 SHA-1: bbca9a77778246d9ea158549ab8ff2fbbfc141ec SHA-256: b5dfd63f68d401174618cb6a42490b059d0060e38bb1c351510bfd5641d6d08d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure points towards a phishing or malware distribution vector. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=how+to+create+sql+profile+in+oracle+11g+manually PDF link annotation
    • https://alkalacarservice.com/public_html/userfiles/file/pivuganisafadiganeje.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vs7o0g51cmu52rdmhf8jgtj0k2/44055012297.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b8093d01505f29e05a614791ab1b0d1d/jijutalimigoboxukega.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d108972c86---gaxoxonezujak.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d60c3b5c3---visusopuzinubekagokik.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/nojozijij.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/12927834332.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070507da67ed---71321551835.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/repativilevonowivagefib.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e35df06a5cd5914c7844c2216bcbcf11/bunugaxitoz.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/34103009801.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0c439e4d0b1fba2874ab86c0492ed504/nusidobixemumepiga.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/088f9f30d4bc8bcf296184ae5cec3597/jawagamapudinapivofem.pdfIn PDF document text
    • http://siam-royal-view.ru/data/files/revuvelumupoxufonol.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/duwefimobuv.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986002f3176---26997755415.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/zikatan.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/97941530862.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/f8842f9e5f812d71e06f40f8b2e7428f/rujojaruzujidokomogud.pdfIn PDF document text
    • http://rld-carbon.ru/file/12429364923.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/nkcnnlj35tgq22rt4oodmivq9c/razetojapuvazuzamaxo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/dolodajowapuxoxo.pdfIn PDF document text
    • 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_off00017dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000195dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195DC 18516 bytes
SHA-256: 01928ba453d171d3288beb96f5a7716d2744a093882c7b8035470a15f546a574
font_02_sfnt_off0001c5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5F9 11312 bytes
SHA-256: eef8ead2be292bec6db9aaa714a2aec114ba31aca78e583617a50f437d6a72bf

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