Malicious PDF — malware analysis report

Static analysis result for SHA-256 0333c0874d5493fc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-22 10:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1801bff7753a5db7cd5907e4b0bf502a SHA-1: 108c0104ee153219ef7b1093b3007cb714201ded SHA-256: 0333c0874d5493fcbe3ae2e2bb73464694fe5418798bba34149a6d3fd23352c5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous PDF link farm indicators and the use of compromised CMS upload storage suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://egf.tw/test2/images/file/vuduvosadajid.pdf In PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/matapenadimokak.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/bonugav.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/fopepiki.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f70e7c91a---lupobegamizisebixuvito.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/33987296054.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ce917d74---3870806272.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mibejotumebokasobesi.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/buwatadok.pdfIn PDF document text
    • https://windsbs.biz/files/file/lutamuzonovujilowomagifa.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jupukosalovakoruja.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/62663651167.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161495dc212682---bewixabigijafujodefori.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/8122717597.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/44176754040.pdfIn PDF document text
    • https://profm.hu/files/file/suwurivisefepukenazug.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/rabinavadufovakuwopevo.pdfIn PDF document text
    • http://kodemari.info/data/files/60673655926.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/64505794732.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/ruwogewezozuxavuxux.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/681293332.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/91073957296.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161300447de192---gixunasefuruwuvalelin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=dash+diet+spanish+pdfPDF 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_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 17616 bytes
SHA-256: c7d7ebaa4ce48c23ee91360c0a51278448049f12f7866d8ae5edc93f63e96dc8
font_01_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10328 bytes
SHA-256: 36a801fbc0879a6b958f3d5bec67adfb9438c5ebc3c8d72f4213345cb0807fe3
font_02_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1