Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48634138a837f90…

MALICIOUS

PDF

83.2 KB Created: 2021-10-09 12:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f49a55fa7afe74e57f80379a8f419f89 SHA-1: 4d0b69b31ad616ad4d8c8ced0050e655a1738d47 SHA-256: f48634138a837f90805f442833bc4188e3e0f2f14269e46fbf0e9db736f9d497
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ih-consultant.com/ckfinder/userfiles/files/33972293802.pdf In PDF document text
    • http://honeystraw.com/uploadfiles/file/79125597321.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c530ed016e---11664319791.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nunidivex.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ab063d42154991ea7e0f573a4656df73/22180794838.pdfIn PDF document text
    • http://selidbe-beograd.info/files/69135668175.pdfIn PDF document text
    • http://mylodge-naoshima.com/36736797768.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/gazakikokanokasujutumaw.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/43228585852.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614b067b2fca6---masodemofilakawi.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/kegodejisosesaxadagul.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/jamotel.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/21702543949.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/zafagulumokijuk.pdfIn PDF document text
    • http://elpijisystem.com/file/ferefegonowagizupo.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/siwipurujejife.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/56642893001.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631575401600071619.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/fujuj.pdfIn PDF document text
    • https://cecprint.com/images/file/nenubilatizazuz.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/tabitasetesefepezikufoki.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/52730613032.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/kilejizarutasebibofebawin.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/138c17c9eb09ffd9da7a9e2c0f9e80c2/14002788301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fundal+and+anterior+placentaPDF 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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 18824 bytes
SHA-256: 6493832d88476407b1390367b67d7fa56a000f30ffc3e2e554d387d2930629d6
font_01_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10416 bytes
SHA-256: fb73f0372b3e6a62f5948d2a62dcc23c240b1a73e698e45d9e8a1955a2333cdc
font_02_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1