Malicious PDF — malware analysis report

Static analysis result for SHA-256 c667ffc5caf4045f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 21:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96a385d3d2db89e3588d343e005c6f55 SHA-1: dec22d6c198502cc7a9e2bcba24b7af04cce5557 SHA-256: c667ffc5caf4045f16b296718efa373d2b4d7123cc7b4df19da9da5cd5fddf05
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links and the ML/ClamAV detections strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bamor.org/userfiles/file/titarewezurogeg.pdf In PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/nakazamojedupadegoroneki.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e94d046985c2f9048532ec14ac9c009f/rosun.pdfIn PDF document text
    • http://donghotam.com/luutru/files/68800553093.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161418fb95501a---49510045257.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tebobageruguvalerarozof.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/rafazuwijenotufede.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f402664ebe---66066398196.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/74225013992.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/fofofumanu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210910110906882.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/vefoleviwafegugomobabej.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/xoroped.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/77807913924.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/61877788878.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/juvekosisoberogovuvap.pdfIn PDF document text
    • http://peoplefoster.com/pliki/lukefawabora.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/14531777641.pdfIn PDF document text
    • https://aayams.com/userfiles/file/11863628235.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/21226031059.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9980a3c---47841248159.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/xesefedodesabaz.pdfIn PDF document text
    • https://adikketiga.com/contents/files/ripenopa.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/siwaluxonagatazakeloki.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/lesigedezamuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=can+you+cast+from+phone+to+tvPDF 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 10920 bytes
SHA-256: 22c3c527aff05e8f36db69ab0bdc1bf972997d28cd9596f9e008f1b4b236596d
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 17800 bytes
SHA-256: e719d49b82709a9aa81c433d86bf8944d369d84037331cdcae459f22b63c461d