Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc252ea65e345c7c…

MALICIOUS

PDF

96.3 KB Created: 2021-08-13 23:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bb61bc0a44677b44642bee6df1922f2c SHA-1: 4ccd72650a7c305c6fdeadeb7b052db0c81442ff SHA-256: cc252ea65e345c7ceeb0e1ae8a4c5cd4692635f805939360161a67a1cb514cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4a3191a636f8b3bc931341db1f8ca4ac/41585817346.pdf In PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/1502230c6eb42d9602e888d4600a235d/filuveneti.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vamutuzikemu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vigujabini.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7637585b3f2f8b54c0129aa0a41e6be7/pulopureku.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d3a7e2b7a---82010723143.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/412116e22138d37b3322df72818c0a63/70794078268.pdfIn PDF document text
    • https://longhoang.vn/upload/files/37093975153.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/62854494705.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2984a4cd---xiwanifu.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/38601517677.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/dogenixuwelezuv.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0382ddfb7731b527604af5090f92e321/wirevibu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce16bb40---9756111527.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0427498d4d---59382554941.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/gupozolofimob.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/74950a9f8c9cd96106771a71a7259fee/11768651366.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210623184638.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5u0neechphr83ra15k0f25um51/savalonuzofonogono.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/51080618858.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/oghthkr2aelb030gvp5s5tmeo7/putobaxogedevipuwiban.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vflglf9g6bl8puo1dig5siiuh7/90203545638.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zuzutefivojax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+v+5+apk+and+obb+file+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10780 bytes
SHA-256: d4453b2a613f57ead0f016086a7f7ed367eb116bb1e8e01b64203583c826fcf0
font_01_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 18072 bytes
SHA-256: 986a58192d6dac6f4ddfcf462fe10917f380ee54864d2274b06ade9d0dc23d4a
font_02_sfnt_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D33 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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