Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5e56213af5a905…

MALICIOUS

PDF

90.5 KB Created: 2021-08-19 05:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c785b223a4bf57247733c43b605b0ff3 SHA-1: 1ab5e77cf3d560339203faa9f4b0f0d590611eb4 SHA-256: cc5e56213af5a9058d7fe065257087fd16403797c4958ef2e2d1aeecde0816d8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/funuxefilituwo.pdf In PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/navixuduvibarolegamak.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jokofo.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/42c0efa9578f9def786afffc726f72b5/98393971039.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tawomiruparapewupika.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/55891470109.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/jeladuj.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wimigu.pdfIn PDF document text
    • http://short-story.ru/upload/file/88812317855.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/ximoxepirisa.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3abbbe51c---95706746386.pdfIn PDF document text
    • http://csp.hu/editor_up/mefofodip.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/iaotfkd5l442i9npkhc2cbn5j3/1556069938.pdfIn PDF document text
    • https://birotex.rs/images/files/momivakutujogaja.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/12185336864.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942468e4d8a---82934612937.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/fuxijo.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bipime.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/tcdtbj66sorqcp5qsnrc2ge6vp/57941364775.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6fa530fb215667216c027224ea53992d/zatujavofunamon.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49e42286f---49720285494.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/bonaxanowoxexebawu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/olc4dfmner4ci0e1auj0ngi08c/depepiwunubaxim.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/purudojukawogazodu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b23ac68e2f---94062350855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+tell+if+lululemon+pants+are+too+bigPDF 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_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 11016 bytes
SHA-256: 26a09a06627308cafeb6dda86f67d2070f14eecfc763e16f324c5c67c06b7b56
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 16792 bytes
SHA-256: 20eae879b1d69774de9c603ae056bcb55062b222695dd35a286a3f9f6ef143b5

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