Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fb95a30d591a84…

MALICIOUS

PDF

74.7 KB Created: 2021-09-23 18:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8097a4fc03bfb802ec8bb44cffcfbf33 SHA-1: 409060923eca957d4a6f85017b79c9c2836181f9 SHA-256: e9fb95a30d591a84600db109399eef236e1648a425352ddeb27b164f11ef2531
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://laborke.ru/uplcv?utm_term=deadly+medieval+arena+mod+apk
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/21dba7b37358617b33c89302e62e01d6/7172480310.pdf
    • http://clinton.abwingsmd.com/uploads/files/xiluwubonuvavixatibozav.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/sititazifivipumudodevig.pdf
    • http://szkolka-wiercioch.pl/files/file/mopikezoziw.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148250057eef---rejunulabowige.pdf
    • https://trompis-tondschungel.de/userfiles/file/79017110496.pdf
    • https://okinawa4d.com/contents/files/doropesamomukosu.pdf
    • http://powerfalcon.net/uppic/files/povopenixapad.pdf
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/64510249537.pdf
    • https://gizaviation.com/uploads/files/23608751813.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30c2f1e55c161e5e69ad9a79e6ef2ace/51964599803.pdf
    • https://tonmathunglan.vn/upload/files/kuredovosamigikofojo.pdf
    • https://zibarajabi.com/cache/fck_files/file/58012907766.pdf
    • http://nousgarage.com/userfiles/file/31690953523.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/zaxijileradosog.pdf
    • http://gocreate.termall.pl/upload/fck/file/levunozerefaraxovuvatitin.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/badowulovem.pdf
    • https://derechosenred.org/aym_image/files/80260163671.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/65688083443.pdf
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/68221074573.pdf
    • http://secohthailand.com/file_media/file_image/file/jekovimikigasowubo.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_off0000c104.bin
621d31721ca5b85cd841eaf9a948d8568eddd0918d9b08b4603bba53632b04f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 17152 bytes
font_01_sfnt_off0000ed77.bin
7cd1f2a62945505cd04d085f3cfb9ade669e1f8b90a9a17646f3081e1371b3a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 10560 bytes
font_02_sfnt_off00010570.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 16792 bytes

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