Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d386752f7af69e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 08:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cb9f78260831a64e1f56a15f60e50c7 SHA-1: 639107897cf4f8a3e0c0e63cc7afdfebe3b4dfdf SHA-256: 47d386752f7af69e8a139c742ad4cb9b0e2b2b98dfc236d049b71cc77fbafe12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malware or phish for information. The presence of external URIs and link farms indicates a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=koplayer+download+for+pc+windows+xp PDF link annotation
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/879e50f80ee5537da7b5b3cf50c721f9/zejusujamo.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/17166139878.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/18908053048.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/bekutajowagelofasa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f7c4b66a---74541339494.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/bilitudurimobise.pdfIn PDF document text
    • http://pmcp-avac.com/files/upload-ckfinder/files/riwekinubikaju.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/koterefajameka.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/tiwenemew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436bd5975fc---53601516104.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/xasezadotevit.pdfIn PDF document text
    • http://artospace.com/pics/file/81298656518.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxemololoniw.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/butisizutigarix.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/sotejikasusi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/dobaberepezubabe.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/28509419076.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/51888100925.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/63574226914.pdfIn PDF document text
    • https://servicepapik.ro/files/68726085190.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/31580809292.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/kiberevanumogutam.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/fefovuzotoledade.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/14414376849.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_off0000b6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EE 10808 bytes
SHA-256: 5367db30c5e55e88290c9afe8c2dd542cbf09f5b12b1e30ee6cd4c6865dc56cd
font_01_sfnt_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16168 bytes
SHA-256: cda06f68abcfb87fe721981472576205ac3cb058b5f759834df87020e4095bac
font_02_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1