Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b732f4ffbca6dd…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 09:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf73ca749e96b553d5a27d95faf74b23 SHA-1: 1b1b72ce0e8425fb2a9a1147b79b75814f43a04f SHA-256: f7b732f4ffbca6dd65e186793bfbcc8ccf03dd72056a9d2304621b5fe6d2414f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to redirect users to malicious sites. The presence of JavaScript suggests an intent to execute code, likely to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shipagents.nl/uploadfiles/file/fotupipuvovesudow.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/eh2us5btjk1j5cifpm54apr520/nowuverunixuxobega.pdf
    • https://laps.pl/userfiles/file/54652472869.pdf
    • https://rocksoliddesigns.biz/userfiles/file/jelara.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/57b8aa8b3d995b96d834dd71be8ac9da/88079863863.pdf
    • http://davidlbrooks.com/clients/868292/File/55577016339.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/057b0a0adb4bb4cea09b983fd5106c12/nevotepiwox.pdf
    • https://shibbirs.com/media/files/91020033615.pdf
    • http://veterina-hrib.cz/user-uploads/files/71816161438.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608590b7ca009---64541990442.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae467ee63ed---votugipakasune.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5a063c52---46515367457.pdf
    • http://asavn.vn/uploads/userfiles/files/85047134813.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6a4d200f7---zawoxugibadipidonexevef.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc55da94---34827136666.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/33485797959.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8c8c1dae---23399322409.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/87ef65e7174ff9c1c6469f7e56d6fc16/67294254830.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/raa2gh9pmti3trq7os1tqrf9cc/dakaganepofewatokexaner.pdf
    • http://msinziniering.com/userfiles/file/lidamapagosej.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a613f2ef25c5f41b656366597d2940e2/buvefusabexidisax.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/087cc852eeaf76361ca18475c1276a97/43745493461.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609277473a4f3---vuguvufamogodase.pdf
    • https://addsfly.com/userfiles/file/30137785685.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=according+to+maslow%27s+hierarchy+of+needs
    • 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_off00010bcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
font_01_sfnt_off000123e1.bin
374902956b550459d0e7e75a3e9a6ff68039353f6175b43d68b2d03eeb7cce7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 16956 bytes
font_02_sfnt_off00015042.bin
9d618c66c5d8938cca1da718d4eb152ef87c349117da894689b303cf12e6b67f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15042 11136 bytes