Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d971c81d5e19a0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-10 22:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57f6a5b4173e9b94014f9877e27d5cc2 SHA-1: 91c83aed18186f9ebfe3954dfa5ebb87bce3f458 SHA-256: d5d971c81d5e19a079e2a1e7d3738edb3198ac2cb062a4a18f2473472cebd25c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kiptep.ru/file/87978500442.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a925f10a85---10559396637.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/434735aebe977054689c54a686c77e05/xixakijozawuz.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/perogixusife.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71191422271.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/dopaviroresof.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/39085169018.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/rukagoxuposivoretug.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/52658062752.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/31262256999.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/13724493414.pdfIn PDF document text
    • http://land89.com/ckupload/files/xedilodusixola.pdfIn PDF document text
    • http://domario.ru/userfiles/file/39331674894.pdfIn PDF document text
    • http://webs123.com/userfiles/file/monox.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/86815402102.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/fedojiwifajezipaxinojetad.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wilevabunuxesomufexad.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tuwexurasenurebij.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/22972998944.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387bc5e47ed---43633452268.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///jibitapokivope.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/gijexuginawasanovopa.pdfIn PDF document text
    • http://elsped.hu/files/file/zugarasasulire.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/jaxin.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/92525367591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pvz+xbox+androidPDF 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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 10164 bytes
SHA-256: fea9907427ea526f7418fc1bf8ff87dee4335f3e1c7aef08b437809e06a37853
font_01_sfnt_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 17008 bytes
SHA-256: f8106f15432c14491c06dcfd20a776fb3b2d52abb55cbe9d6c8b6ada97b1a90a