Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be9d39f57314baa…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 07:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 78b362e0520c0331d8e2d4e20ae9a54a SHA-1: b1b6490d70a9778ac113fe768deff08f2a36c0cb SHA-256: 5be9d39f57314baab1499973c4a1433af577563c06c85eae76b704b88d05a24a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://markiza-trade.ru/admin/ckfinder/userfiles/files/62982143722.pdf In PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396d5d2221d---65360232887.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/98464754112.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/dimulesi.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/92929643227.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131925f23ec3---33361917034.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631102163.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/45124809123.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/92341159623.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/91313061754.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/36022219046.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/99800023193.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_27678BD6FD3F26EB.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/72896192672.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/42294189868.pdfIn PDF document text
    • http://hasyo.net/files/file/romogokimuli.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/lavikuvuxiwugijevebivudo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e9b7a727ac2c95dad33972eb93814201/koziwuginoduwasesunekufa.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/41964088744.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jpo34et4h8kuqi1m1aj4d26h5k/talijojipusuxudujoda.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/69149309422.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210907103601.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/fixaxarenaguripo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=music+apps+that+cache+for+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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 10764 bytes
SHA-256: 0830a125af5949f0463635b428c85da2a3c2df8c3a59867e2818ae99ab997d5b
font_01_sfnt_off0001062f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062F 17624 bytes
SHA-256: 05d63f3c5a2d8e6cccca57c3152dd7a2498721a74b0e73e5db5600ffacc17663
font_02_sfnt_off00013380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1