Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c3a9b62006156e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 18:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28598b88edf68d494a83625e5b222d88 SHA-1: 4ecf932e3a2d434dc7ac6f15a62c54208e053ae0 SHA-256: 00c3a9b62006156ea0ddbe194f0cbb505e13edb6b2398b776027fb451f7346ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links, including one on a compromised CMS upload storage, suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thecountryclub32055.com/userimages/8045290491.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/8733549457.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/903f8b1c5b2dbad5f0a7ad934596d1e5/zewezibatutofinimofadoxux.pdf
    • https://33mobility.net/uploads/files/89217949667.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/3210173168.pdf
    • http://bassbasement.org/userfiles/file/fiwuf.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0340527c6273b5fee5e90260e56699f0/96672264621.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137350b39463---41009766127.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d313ca2031---lubelanaru.pdf
    • http://www.binghan.my/userfiles/file/bepovoxisobewo.pdf
    • http://volkshilfe-ktn.at/images/content/files/satixijabodamu.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/89586609727.pdf
    • http://orikon.net/Images_upload/files/somovilowudirikufekovon.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/72176566531.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea00c936d---budagumukaxujizadewusul.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/nufulavu.pdf
    • https://kaskad-74.ru/images/uploads/zikobaremavizaguwevutasi.pdf
    • https://walkandsmile.com/userfiles/file/xegivajitapadaguwej.pdf
    • http://tyros-club.de/userfiles/file/65803329179.pdf
    • http://marymo.ru/uploads/files/kumirizusefibokifek.pdf
    • http://clingac.es/d/files/89674084529.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/67471217996.pdf
    • https://samngaimarble.com/html_upload/file/26921728569.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+print+pdf+to+booklet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 16792 bytes
font_01_sfnt_off0000fac1.bin
fab34fcb0dbc64922232fdb47fe1ede21f4e4d36ee1ba910aacb907f943e0380
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 17868 bytes
font_02_sfnt_off000128da.bin
681622fc879e04f75e11198d04d95770ce41ccc2f7a824eef723bdbe83868b3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 10472 bytes