Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb737240289bba6…

MALICIOUS

PDF

88.5 KB Created: 2021-07-01 00:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc730a8cc0e9d7f035e86315304d42ab SHA-1: 04f4833544cd1fe5fe79b25b96ef27dfc25d97c4 SHA-256: 7fb737240289bba6924a300bec8e61297eb4f17baa6923b2b65a84b94baa44dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute further malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608de8e05d43a---jiwixub.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2f42d085---35354727391.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086846a6bee3---66345746476.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b636b7b1324bb8eadd55dc70f6018f87/rirajoravizij.pdf
    • http://amctop.com/board_data/editor_img/file/202106081952.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd512eb0692---90763245855.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a60566212---45017198910.pdf
    • http://pkynfe.net/userfiles/file/femipilekiwuwu.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/t9orkcb8n9bf29vocnvsg4srfd/sekogos.pdf
    • https://hosvagyok.hu/userfiles/file/wewibibi.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a275c4586a5---xekusegine.pdf
    • http://p-itos.net/admin/userfile/image/file/gowololitugovawinuwuxar.pdf
    • http://omonetach.pl/foto/ilustracje/file/takisefogikukagokatunefi.pdf
    • http://edu-family72.ru/content/images/uploads/file/1740662311.pdf
    • http://extracam.es/app/webroot/arxius/file/61908458853.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a02106f2---29419912388.pdf
    • https://108pizza.pl/uploads/userfiles/files/xagifubexulovofarobin.pdf
    • https://maxflowfans.com/userfiles/file/46131365566.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=software+dwg+to+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_off0000f5c3.bin
133acda468b06bb41de53e5fa5add2e8f45f51c4029e21945e8863c59d84b513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 18768 bytes
font_01_sfnt_off0001259a.bin
be96097d29ce4a66682315bc7f39598c188a10ec79cd7d72d9f26a89d6d064da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 10424 bytes
font_02_sfnt_off00013d3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 16792 bytes

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