Malicious PDF — malware analysis report

Static analysis result for SHA-256 c623ef71e783650d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 01:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b77a3e48152bf7df57a64d600353c722 SHA-1: a96eae8a0573f7d068ceea7568427d1c6a004ee1 SHA-256: c623ef71e783650d3f1d7d4c6121f55776df211ae568adea0e07a8712f790c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0d860b33---82061660855.pdf In PDF document text
    • http://energo-winstal.pl/userfiles/file/88992240147.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/56529503254.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/xifene.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7tk0309s3ovh80l6rakcdbpoj1/47922101369.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/96863424755.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/letekidek.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/wejavobapuzifinoj.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/74482820228.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcf56e887---kopegefasuzixuvatobesav.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jpucdclj3m82d2l13upkknhg53/41577606817.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/60327312208.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/8317645073.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/murejebe.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/nevasezasafuruxezivol.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51d7e614b---51302530340.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/15359925620.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/pakobekapibozogiripurola.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/99770142727.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4af93031c86dcff7f786537544ad390f/zevazuva.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mamiboseb.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e417ad8fed---68544592717.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/vofobaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=young+one+of+frogPDF 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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 9908 bytes
SHA-256: 1f01113ff129347664dfec7125ee73ad2645da1db8f6ed82c3ab0f4162949acf
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 17040 bytes
SHA-256: 1b3d4ad60522e7ca532f444f54edb67196f8183ef260f870979131c440277d00
font_02_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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