Malicious PDF — malware analysis report

Static analysis result for SHA-256 be55d2abf2dacabd…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 11:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a3eaeac1ea6def592635a9626e8279a SHA-1: 450021040d76edccae11fabbfd7bce5fd1148f09 SHA-256: be55d2abf2dacabd286c6323e3497bf105e49dde819e1910356f015a1044873f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=kanina+in+english PDF link annotation
    • https://diphong.com/uploads/18673006256.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/lizomekor.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/paniwikudirifudapu.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/32343527620.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210903093343.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/84168041101.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/79926931451.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec99c798f---6964983317.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/mabafumemurufifixe.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/69583294283.pdfIn PDF document text
    • https://akemi.ro/hirek/file/47482791144.pdfIn PDF document text
    • https://questyme.com/userfiles/file/zurujufegowepapo.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/88187369042.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/5540817462.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/28016091027.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9437b274e---vemisuzenemenad.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/78655196857.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/posunufarogozekekazujos.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161354a6538519---47329707183.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/piranujefaza.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613883702600c---xepasenexisemumide.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/76684134499.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/rubalodewugotokelepipoz.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/moxepizifebotijerisepu.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109181609087942.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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 17088 bytes
SHA-256: f432cde54b48ceeb45e745dbe9debd98a66b21a70724717fdf15ff51a778a903
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10060 bytes
SHA-256: 46fdbd833243dc243f62b68006716ccf161fbd1ab9468c1ef5ed5ed1b7a87f63

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