Malicious PDF — malware analysis report

Static analysis result for SHA-256 02660085a01cbba7…

MALICIOUS

PDF

78.5 KB Created: 2021-06-30 00:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a505810c7acecc77ce47fc4444eda5c3 SHA-1: 32a2e57fd8f5d7561306e86683e6a2d539c82a48 SHA-256: 02660085a01cbba70edca99d870078f83b9a48c2688f0990e04d3a22b493e4fd
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc7f3bff1---15536961932.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5bac86730493a27c753e018c4014bc49/kiterupo.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xevaxanere.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa7fa5863---92586016783.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fba8b454d4310eeafcd59aeb2ab396bb/kafukijelususi.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gerivununo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cb21debeaf75e7cd83573760c6a664be/penevepojudaso.pdfIn PDF document text
    • http://sparkpro.lv/content/file/56931292141.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085245bc0870---dixukevutakadituzunune.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764aa91f7f---1084639865.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/7328c3615a0bec1ec05ffc2b7ea4f701/fezesiluruv.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/52951028470.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/13435761495.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b97c993d85493f544237ff8dd18dfba7/kijefitonomuminusumoda.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/tudukozakibod.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/jijewozimafapozemud.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bivukililupusuxuzude.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/bolomopuxaxipopaba.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/mejuvekefilejozonurid.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/mijanoxevu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce7250c3994c2ecee3d3409fd4fce2c6/29687253283.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1i4c4iut3il65cb03t0krsm8nd/dotugaxopukak.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/61073941067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=you+are+worthy+hillsong+lyricsPDF 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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 17676 bytes
SHA-256: e48e7c9bca5746de979a30ddf30140c7d6d65fa5fe7fff5f1bee8de9a0beaba5
font_01_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 10792 bytes
SHA-256: fa874d1d480bdd92378600f77cec67ca3b1dbeb8cdc32cab981840aa9fd3352b

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