Malicious PDF — malware analysis report

Static analysis result for SHA-256 1458b21b7ca8abdd…

MALICIOUS

PDF

73.5 KB Created: 2021-07-04 21:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 975fbd215d9657fe8e56ad57f8629bfc SHA-1: 0a0d6c079fa1981733548ba78c476ce237ae06f7 SHA-256: 1458b21b7ca8abddd22371dd6691ad01688f70e0fb76eb77ef3b05e18f2be9c6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classification and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and link farm heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3f78a87b---novawavi.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c26583bd487---zigip.pdf
    • http://bindashnews.com/userfiles/file/34932039595.pdf
    • http://ahkjt.com/upfile/file/33322674265.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7df05699---dovamevepu.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/p9v8mllo0pllahr22iiu9jg0km/15981227359.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4007cad32---sezegagan.pdf
    • http://nuitsdartistes.eu/images/file/76449515094.pdf
    • http://hpworld.hu/data/pic/Image/file/51938150976.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/xujibarekolirutup.pdf
    • http://pensjonatagat.pl/userfiles/file/dovimegirizotuluxel.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/muzomupesegi.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/11725e8e43e18c2225ccc5022f86c0e8/poxutilud.pdf
    • http://mobydick-band.de/fckdata/file/11317518166.pdf
    • http://cs-web-design.de/ablage/userfiles/files/jetubagitug.pdf
    • http://fine-cottage.ru/userfiles/file/kudeg.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090149b8f51a---35026738.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/06a4bd48cbf1d9b35836080380da20d0/74260904286.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/77697562b8f675b8d0e7fdaf9f9bea59/90364741309.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2138a801d---zemukunugupazupuloxu.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d9d09513---98063407485.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9b0c43e1---rerawejojovateb.pdf
    • http://yjsyrj.com/userfiles/file/nujalim.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085ae61120f9---57894969621.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+unblock+my+number+from+another+phone
    • 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_off0000bd79.bin
4f916de06bd369d82c8773e8f9434cd6edac31598d968426873ade86446a66df
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 11240 bytes
font_01_sfnt_off0000d76d.bin
f9efa5323aea9c87a1eaa32bc6815815e1c96b351281ef3be37c0180f5208574
pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 15936 bytes
font_02_sfnt_off00010085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 16792 bytes