Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c64ef120a1c3420…

MALICIOUS

PDF

85.2 KB Created: 2021-09-18 06:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eafbe140699269cc21344ae84e2e3718 SHA-1: b7627a8948933f2fac2db3c7ff123fc91053191a SHA-256: 7c64ef120a1c34200e1a95e6692a9a60a23ca7340d2be58cbbd954beebe9b076
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://roomyab.ir/basefile/roomyabir/files/lopuva.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/31474892136.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/86813014387.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/52708208733.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/98542566801.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f63acf59---wifakarokimadar.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/16202272068.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/xilazoweposatiwemuf.pdfIn PDF document text
    • http://fo-prefectures.com/pages/files/68138593865.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109160008036899.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/kusajo.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/dupizuberegakowos.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///disotexatibolu.pdfIn PDF document text
    • https://euchebnici.com/img/file/fapofaretenakariwurede.pdfIn PDF document text
    • https://kede.org/userfiles/file/22769201916.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kakonisupopo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405066cb05f---60341567910.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377114055b3---zulugamizigidel.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/funarukajazoturaderezisuk.pdfIn PDF document text
    • http://freeorden.com/media/file/63459317201.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/bupibi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/pelerizorexem.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/55372558531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=toca+hair+salon+4+pro+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 21652 bytes
SHA-256: e4f30db0e5b928b9ade3ee17296a52f90492e19f918a835e73515cba4be10aac
font_01_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 10372 bytes
SHA-256: 76b6746400ff6efcd64f80f9d80ad42c01554cf933365c0e9f594dbe8db633c4
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 2032 bytes
SHA-256: c792d173675150f70763584c90644340936b7d4cb682afbb94154733b25266d8
font_03_sfnt_off00012d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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