Malicious PDF — malware analysis report

Static analysis result for SHA-256 420e6c745165ab6c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 12:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3251bbd85f33ab41f7b20b7c8e8e868e SHA-1: 44e88cd0aabe0f3ed0c441b91f541e0f5ac004f3 SHA-256: 420e6c745165ab6cdd9736256a239d8962875bc9242bb9397877f3889a0e3c5a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

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 https://philabc.ru/uplcv?utm_term=live+wallpaper+one+punch+man
    • https://silverbirdmarketing.com/pages/images/file/41257197433.pdf
    • http://waypl.pl/upload/File/kozukidomajexixanufosedux.pdf
    • https://pharmnet.cz/ckfiles/files/files/lilawugazajokodopuw.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/besowikeje.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/rezoliliguxuduwiwobi.pdf
    • http://dallard.fr/ressource/site-image/files/josilopibe.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/lutufipikosad.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vuzoruxamiwilivulam.pdf
    • https://resttour.com/images/userfiles/files/88325904098.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/liduwoxadomuxubapajujur.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7ae4b8db---91108324623.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c3ba9889b---42684881242.pdf
    • http://tehnicgaz.eu/files/file/87540836648.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421ff09722d---28258929940.pdf
    • https://snowcat.pl/admin/ckfinder/userfiles/files/30312384856.pdf
    • http://filippodelvita.com/demo/userfiles/file/73269650646.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/47713309489.pdf
    • https://takarasushimn.com/userfiles/files/wanovedekubogosiwalo.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161375aa946f56---89422835486.pdf
    • https://www.vignolaweb.it/ckfinder/userfiles/files/83956799770.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/14811979459.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb3dbae8c---zanugedu.pdf
    • http://vincitydata.com/uploads/ckfinder/files/89059868020.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/5387461921.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4c0b8f49db213113f8295508afbebfe3/loteregi.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_off0000c2f8.bin
0f34a8481611116ab943df6433df66767911c0a92a0490be01c58e4d9369fb9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F8 10580 bytes
font_01_sfnt_off0000daea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 16792 bytes
font_02_sfnt_off0000f2fc.bin
ac0b25b1f87da4f12873c57c51b4b7cbf3c62a37c2a338e5cdf20dcc294ab6a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 16968 bytes