Malicious PDF — malware analysis report

Static analysis result for SHA-256 2698b86bb6026ed0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-18 22:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00272c1b62cec5c6229d026e0f83aaa2 SHA-1: 1278aa40704c0f18cfa9b989eb479873f82ca35a SHA-256: 2698b86bb6026ed0b106f70df3bf95b02b57c9c25baee0eeb4ef6bc2d28c67e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://webcertain.asia/contentupload/fckeditorUploads/organization_/file/45649639106.pdf
    • https://efckrakow.pl/userfiles/file/kegejuwudutiwut.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6d30a604e48010d6986ec6b098724518/23258899838.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/rufrvfoh3kaddj9169mdfi1oo7/getoxinegimowupirepazun.pdf
    • https://mytopics.it/uploads/file/pewumuxepatobevezoxuje.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tfr45485d1pc6hfu14qu9va2an/nijusopadekid.pdf
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/2588221186.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161435ed40f66b---16625746134.pdf
    • http://80tner.friend-match.com/upload/files/rotederatud.pdf
    • http://lechioutdoor.com/userfiles/file/70154425010.pdf
    • https://syntellect.ru/Repository/file/febomokumokitopobimewo.pdf
    • http://master-vin.ru/files/file/41556667755.pdf
    • http://euskararenginkana.eus/files/galeria/files/61145289115.pdf
    • https://togelunited4d.com/contents/files/wutipulolixetuzilupakijo.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141317a000da---nelirerumofijevelof.pdf
    • http://lammensfilip.be/uploads/files/74109000743.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/zirojixitubitudejeguso.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/88745754799.pdf
    • https://stephankeppel.com/userfiles/file/dukinunilavamebugi.pdf
    • http://awfiowv.love-mrt.com/upload/files/37574756621.pdf
    • https://corpusbg.com/files/fck/file/87857476502.pdf
    • http://855solution.com/htdocs/cljr/data/files/72230394379.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/54051476708.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/56920068749.pdf
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/65489041547.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=simp+detector+roblox+id
    • 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_off0000b7e7.bin
acd382e09ca8e8453535b3743751070f073126813044264a069bdb376347bdab
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E7 17052 bytes
font_01_sfnt_off0000e44e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 16792 bytes
font_02_sfnt_off0000fc65.bin
ccff52c63fac03d2db18a1e2ac3c737c57ccf48ca8dccc170a8f557c466a713e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 10556 bytes