Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d5f8d38324ee2a…

MALICIOUS

PDF

89.1 KB Created: 2021-09-16 09:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36711c762510907f82514b89b362dc9b SHA-1: cc26bd767a2273204b169c2fdba171853c619c9a SHA-256: c4d5f8d38324ee2a6606c344e2f8d9206df18a6eccb716959febc3b936f58d77
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.parkwaytransplant.com/media_upload/upload/files/bazidezozevepem.pdf In PDF document text
    • http://31kouqiang.com/userfiles/file/1631297988.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/48182115886.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/rimufu.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/66467849159.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/wefurezekiz.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/58150656936.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/71435232247.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/77377605647.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/nogomakukukeli.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/nibujebagexamom.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/wizexa.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/pakarimulo.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370d8492487---naxezerutulikirized.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9e2f4ebc58b2532635955cc45112b6fd/nabomuduwi.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/tazokuwubagabeju.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/netogidarafopikofowikoduk.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83663a4d5c6ef5a756f0e5ab8efec8a0/pujasademexejutafon.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7c730f725227a6d6e48ae8de73cdde62/bawilusesu.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/54676261894.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/zefitolugabasonuji.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/letujosojefarebefapunaz.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/27780957386.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090221332573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=chromebook+play+store+waiting+for+downloadPDF 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_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 11408 bytes
SHA-256: fa7a87016e75f7e26a0dc0ec6bd5cb567a6c3ad5fe7d034af54c57437b73d1df
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 17092 bytes
SHA-256: 6837b0043604ac809e0adfca46820fbc4c925460b2355e3e5203d457aa1e193c