Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2062610805bd71b…

MALICIOUS

PDF

110.5 KB Created: 2021-06-27 04:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d1a8ec56b725c60de6637a6c5ff72f2 SHA-1: c67be4fb2b51848b0c3d68e3e500672c6207aad8 SHA-256: c2062610805bd71be703478d495c8e76820910b2b744644a0c3797c905170291
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e7d51055---31283127751.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/485208054662ffd4f31fc747187d9914/77453830946.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3f3d864974f1c351bfe1e19927f74dc5/72796037453.pdf
    • http://solee.cn/ckfinder/userfiles/files/72821908812.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd62cbccd---zogunaf.pdf
    • https://vieclamday.com/userfiles/file/xebamaxoletugisuwim.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/marulevug.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160868c52af060---85830733705.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162542b732---forakapuloliwiwikopen.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608513ece57c6---keworoguvetetuw.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b97342c4---petorivowivofanedi.pdf
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510090212751964.pdf
    • https://yuss.it/file/77306221627.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd85548f0a---sogobupozibagogujepeva.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c456555823e---sisakepilu.pdf
    • https://kuepancong.com/contents//files/38431568883.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160778955544d8---72214397157.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/37367367977.pdf
    • https://sluganarodu.org/userfiles/files/19475777511.pdf
    • https://motacademy.it/file/jajawezozaf.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2e01a404ddb95aa9f1e7da756c8ebaed/19002129651.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nuue0tc48urhintqa1n3pfe5l5/tebebobojegosedulugokod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+does+it+mean+to+be+an+associate+in+a+law+firm
    • 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_off00014c11.bin
a21f2bed883217cf814a56d117fd4c6e7515e6fed5c04fb4be3148407edc4506
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C11 17824 bytes
font_01_sfnt_off00017b1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B1B 16792 bytes
font_02_sfnt_off00019332.bin
02478bd4a70de3cf37d1cc4b40a3caec1c9680217028590992a4bcb8300503d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x19332 10960 bytes