Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2c855bea33202f…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 17:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b322912569f71d86837afe51bcde450a SHA-1: 2eec2278a290cb62d3937652a25ea70badc98c0a SHA-256: 7a2c855bea33202f1ccac797e711b1a2357772a9e54632df4d3b65d02969d7a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=tubemate+apk+download+latest+version+2020
    • http://hatowo.com/app/webroot/uploads/files/fijati.pdf
    • http://zechnerbau.at/images/content/files/fuser.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb781aa89---98986621154.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/835099347.pdf
    • https://vendax.ro/files/file/lalimamalikajubep.pdf
    • https://rosanaalvarracin.com/userfiles/file/88117245622.pdf
    • http://drsuthichai.com/userfiles/files/vovidabogenaxoji.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/72231482427.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcaa9b770---werawururape.pdf
    • http://boston.pl/fck_pliki/file/43302549395.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134a40d836eb---35327565673.pdf
    • http://agrion.org/upload/fichier/xiridajugezujitele.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e93b0234abddc610fbfeafe6bb15edb6/zufodozesu.pdf
    • http://neogmbh.de/www/sites/default/files/userfiles/file/xuganumonurit.pdf
    • http://www.vikingmaterials.com/img/1979300250.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72dcd2074---71144627449.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/kigofetarurizeve.pdf
    • http://locke-3c.tw/uploads/files/202109091434431718.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/95047232829.pdf
    • http://deauville.ru/files/file/vojegaguvusaru.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a15de25c73535ad2fa4b47532e8618de/vesifikedutiwuzolonujavut.pdf
    • https://glbtrader.com/userfiles/file/22612404578.pdf
    • http://sanyosushiglendora.com/uploads/files/kelotatutidixinisulomovof.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ec7cbbdcdfc7d7b0fa1d1fc7f52ddfdb/fazoxa.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/2888921961.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/rimusedaragorefaz.pdf
    • 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_off0000e5cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 16792 bytes
font_01_sfnt_off0000fde2.bin
327a1fbcb39a78af6cf716d39fa5e54e2939ce241e512d13292c7845200446dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 11244 bytes
font_02_sfnt_off00011812.bin
2a29c46e353c496d79e0629558e7cd09756d6486d6d5a5f825050b22c7ae2e2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 19208 bytes