Malicious PDF — malware analysis report

Static analysis result for SHA-256 106d19d3db6c461c…

MALICIOUS

PDF

97.8 KB Created: 2021-09-12 02:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a67a60af8bc7bee8b20d8d88ec18e14a SHA-1: 857739638f925e206550eb21860faaf8fa0a40f1 SHA-256: 106d19d3db6c461c890fc67c5e48fb48761d869cd0d8e0a59efc654bad4e7449
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://shopsuathientu.com/uploads/userfiles/file/sazomakosimiwoxuzezuwul.pdf In PDF document text
    • https://tatsolarlight.com/uploads/files/fasupapafawe.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lh54p9t6rvi1dieg5u98m56a10/98054546644.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e2e28ad7---judojivi.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/8226098241.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/33592334842.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/42373110284.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/rubezunusafikawixaj.pdfIn PDF document text
    • https://moolans.com/uploads/files/89341511823.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/rurawaniwajusuvip.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109110150127815.pdfIn PDF document text
    • http://wwstationery.com/files/file/xupekofifemesunovuzupimeg.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101848066947.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4534619a1---42613116154.pdfIn PDF document text
    • https://trystsalonri.com/images/file/nataxutapipamogasi.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/366fbce2536de999f54c72b86de59e1e/51435846397.pdfIn PDF document text
    • http://mestan.by/images/file/54099498657.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1f6cca34c5cf811d5f43d0962f59b76c/58577681261.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109090601272240.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210911201758.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161324527d01e6---40317055671.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210906160617.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/sejemojako.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/10245272477.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210911/file/1631316729.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/88291908121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+comic+reader+androidPDF 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_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 18304 bytes
SHA-256: 26a1e36a825531815bab961c214c376d46c5330473532b0c19fb71cdd7ffc6d9
font_01_sfnt_off000148c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DB 10644 bytes
SHA-256: 9bdef028197ac8e3172ad233417f749ce9d2f47b46ec0a59b69d32fa8bce29d9

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