Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1953e3f3de61ef5…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 02:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc8cbfca122effc83ef66f7a19b42121 SHA-1: 89ee6edf3d139ad1aa2e70cb5fa5851bec846e02 SHA-256: b1953e3f3de61ef5ba3a3822ce5bf99ea0a9147f074ef27a470cbfcf0e901153
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.abcklima.hu/data/editorfile/20771836853.pdf In PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/zubipexaruxofuto.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16132d66946e0c---61137971629.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/bemiwiganuleroropapav.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/22584928654.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zirata.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/89666017598.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/35761156567.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/panuseporidilevitufoku.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365edf5a291---sikunisujagove.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/renodogaka.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zolupunodunabuxevogalo.pdfIn PDF document text
    • http://candientuvibra.com/images/file/mojoxorelulotiduromipu.pdfIn PDF document text
    • http://rapet.hu/files/77673882473.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/4261848842.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5482e949---97443052329.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/38141352463.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/80487547973.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137db552806b---485415552.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/merowolatife.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/judafe.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xufanemigibazabepujo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ce27cb515---motusirakokafilume.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/10823169370.pdfIn PDF document text
    • https://cargotavio.ru/files/file/sokonerozagoruzujuzaneron.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/29703175628.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/nanabodixisiwoxaki.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/21408093923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+hate+you+give+123PDF 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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 10556 bytes
SHA-256: 2157d180997b342fa25594c7280ff0c4d568938cf1dda5442e94997d6b497387
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 17888 bytes
SHA-256: 86459d36de6c869d261e519fdbb832a68b471a7a8eb80685c205d07fd8d24506

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