Malicious PDF — malware analysis report

Static analysis result for SHA-256 79059111ee4b3778…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 12:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42e52809aca527893e6f1012284b30a9 SHA-1: 4c7ac2f6b4a3ceabf10b37c441ba5a63df9f292d SHA-256: 79059111ee4b3778a039043b117449ce26c657b04cce3dc9d4ea767b06c917d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://archism.ru/uplcv?utm_term=eliminacion+de+la+violencia+contra+la+mujer+pdf PDF link annotation
    • http://liqaa-lb.com/files/userfiles/files/vakufifedanawogidavawade.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210827015659450.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kobugus.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b022b395c9---39515912266.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c509faba68f---32104917944.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076de6262a66---wovutil.pdfIn PDF document text
    • https://heyratacademy.ir/file/jolegebikosumo.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/lidezagoguwugujeleme.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/kaxefuvixi.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/71192055767.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/fapenixo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42c0788b0---81366612276.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jarar.pdfIn PDF document text
    • http://k1a.ru/images/files/file/56606560807.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7961fd34277643000895ba28ccb8b618/98469550966.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981b7032fe---kakewasegatujusoze.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/12474022314.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aou82imfcts1j11ihgc55k522/vososogofe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf635da9447---43328969040.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/jipupigobizirivisita.pdfIn PDF document text
    • 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_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 10892 bytes
SHA-256: c4a02f05cce56117c25cbfe8473e1982de68b91a60d0a44e1ddbb25ad6f5fb41
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 18496 bytes
SHA-256: 296495b99795d4e522b3b904514b76937a3c02708197f9db86511e12384a9111

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