Malicious PDF — malware analysis report

Static analysis result for SHA-256 7284d3fc406334ab…

MALICIOUS

PDF

79.4 KB Created: 2021-07-17 03:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab7d00fe6b4946eb4bcae06ad7921770 SHA-1: 17c9273f15610b6196ab1e09167c3c0d5d08fa04 SHA-256: 7284d3fc406334ab01c03e01a04b2fbadad265156b7aa2989933c0091b3d7de7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious. The document's structure and embedded URLs suggest it is designed to lure users into clicking links that lead to further malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b49622eb63d---26433065041.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099ece4c747e---74730136166.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0f0e146b---figuwiduvegukemelisavu.pdf
    • https://alajuusa.ee/media/contents/file/11593799249.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dti0ve57lfj35ojs6fjvrkuntd/wiguxeselaxenot.pdf
    • http://cherryontop.pl/upload/fotki/file/korixebitaka.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/n70lribdjlmi3amuj3gs67t3nk/12554778526.pdf
    • http://jatyn.cn/upfiles/202105/file/1620814830.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8fee4b1ea65c06a9071e25e388deb0c2/lawuzojawojolosoloduju.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764a6f64147---79430182527.pdf
    • http://jrpst.pl/userfiles/file/minazovefujamusodil.pdf
    • https://cpsguffanti.com/uploads/file/gimigofosak.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a672d4cdd2c---xexexarulaterunopafeze.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/a482d0bb9b929ecead201800da773b36/xabasojowulaxezanoso.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c7d7e9148b29fe37f490d315da9d1ce6/gakuzipov.pdf
    • http://feuerwehrobrigheim.de/upload/files/44358090378.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/terezetuvetako.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091e56a23312---56351692126.pdf
    • http://omonetach.pl/foto/ilustracje/file/91026485682.pdf
    • http://marty-triple-m.ch/inhalt/files/jizoxomemufegoge.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a299499a1a0a9faa4e03b1fa5b5f3576/69266103450.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ebbf418e2f58381c446f863d4234f4e1/nexebipeju.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2047c6e9bd5fc80ed4c294da8934075/40485044259.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/80293928127.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lychee+fruit+in+malayalam
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d234.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 16792 bytes
font_01_sfnt_off0000ea46.bin
db63e4f6d47a39b5e0ad535fac259211957a0baf7a0e80710ad0f4dd6d8d4954
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 17364 bytes
font_02_sfnt_off00011733.bin
660d39eb9da6e1ce5570c006c724aa82cef715e3f73519516727fbcc75eb0396
pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 10484 bytes