Malicious PDF — malware analysis report

Static analysis result for SHA-256 df91266bda77e616…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 07:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 541a59e2feb5d8910984180cd2af0cd8 SHA-1: d340da2f0fe2c4b23df1682950c67e214d17cb26 SHA-256: df91266bda77e6168af1f6396da5b74706445a216cf633e35f207d0ebf91e7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external URLs, many hosted on compromised CMS uploads, suggesting a link farm designed to direct users to potentially malicious content or for SEO manipulation. The presence of embedded URLs and the nature of the heuristics indicate a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=free+online+math+worksheets+for+4th+graders PDF link annotation
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5a50eeb7037859f0ef64b574108ab062/51581088179.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7d23f85ba6653aaa4046068c210deff8/wejizamufinipuvo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae210d0ce75---kebudakapi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ca0e1070---vazukidafi.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/90496335374.pdfIn PDF document text
    • http://starsunited.at/upload/files/benonodegesidara.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ee0e0992b---jitatoguzujikowigimu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/zeraxu.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/sovuputojodi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1565af87a1a3c055f3ea4d4d557ed580/90953403477.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f769ac47526f32473c3e213a22b780f9/doxaju.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/bidiseboxugifamasaxe.pdfIn PDF document text
    • https://aksusu.com/upload/files/1572930278.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/putor.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48802228084.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/taduberodajovimokarok.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/46116869705.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/kimoxenora.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210816185228_bo7h3a.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8giebqvr2vj8uuf0m1ti15mko3/1173196205.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/99300514742.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/72556265946.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/depawukuriwaso.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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 11036 bytes
SHA-256: a5665a8b1f46e27545780de4f473cdc5e89bb1a0c5dc222bc7192872fc0cea6e
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 16996 bytes
SHA-256: 49e2b9b1173ba5771c136f1e56e7c14d48834f3bfa6ba83af975c7ebb4ec8247

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