Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a9c2c3179cf214…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 07:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83f41dd8a95e515cbeec968978e31371 SHA-1: 7a898139ab6b652bdc0924eda62070c83afd5ead SHA-256: 33a9c2c3179cf2146c1bc8d47f8f8413fd532db7f0731727da7b0b99be3bce88
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on compromised websites, a common tactic for SEO poisoning or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to lure users to malicious content or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://galettedesrois.hu/userfiles/file/jaxaxegezuluj.pdf In PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/91205188814.pdfIn PDF document text
    • https://hiroyoung.com/data/files/revixebi.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/xebelelajiwemiru.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/88913855190.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/jewubirajakoz.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/41668679486.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142feac44694---putame.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/zoripenozawibopoduvotoxiz.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9bc177231affb8407076d39b4d03c482/18403254919.pdfIn PDF document text
    • http://lovesenergy.nl/file/relexewobejibevigugofigu.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/keniwa.pdfIn PDF document text
    • http://att-na.com/upload/noradaridi.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fowak.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091115473373499.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/robira.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/13484190580.pdfIn PDF document text
    • https://alpinashop.bg/files/93803240284.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/ravigafuxofesifaz.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/wezirabevavelozezu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16141b3a6c5c30---72601606124.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sakuxududegowurag.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-4/20210904095032115897.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/52021637693.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/rerobimomofebebi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/90213959380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=boruto+season+2+episode+1PDF 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_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC75 17364 bytes
SHA-256: f267ca10f145274e0b2a7ae649884ff5632beb09ed679b1fdf5075b931e7cdde
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10664 bytes
SHA-256: 6015b3cccd05076bb63e54795e529b04775f38aa07099d1bf78d27e908b9926e