Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f4d5e60e133f6c…

MALICIOUS

PDF

84.7 KB Created: 2021-07-14 05:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd4c81f79b789667c14eae7d99303501 SHA-1: ebe9ab94f774c2cd9ca9eef904235c231942856b SHA-256: a3f4d5e60e133f6c6fbfbd09a19524a12e1f481069a7b28a38b26beee13aee2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and other PDF files. The presence of multiple external URIs and a high ML score suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4be49d311651223b9c509f19dfca8a03/tutizuwinipinixo.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3f4e1aa9b0f6643e7bdd2a6c79273bbb/53295519583.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/6ef0f7ab34e768854207f933e08d2eeb/20107444699.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/kosomopeletapagewajunuw.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/cb45293a3e33cd0a5775f6987d45b43a/57415609376.pdf
    • https://paroles-vives.com/ckfinder/userfiles/files/18525360549.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/31416671368.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ad3b0536f884708c0c57e72473f0d06f/1089724714.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/2aa7f5cfe933c01c6cbb331235405dcd/29280548724.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21a62fd53---68059104696.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082761906b5f---72717140471.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ccb8ac2d---78273413999.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfce70fa2---wegidilop.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ha4qrtemkk9sa4e1vto3gsjqu0/lekojatikinitixesugewawe.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/897d238a12504aaeae2008a45c61d33e/biwab.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d3d54366---80944220344.pdf
    • http://swaminarayangm.org/userfiles/file/semopivekomowufarifaburux.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2a3440c6---55948372838.pdf
    • http://terezmisszio.eu/files/file/61036959650.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf285eb571---milisuv.pdf
    • https://carlojans.com/cms/file/sufisopesi.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/47977841842.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a6ebfb06f28f0bd9c7b78a3e96a86b36/desom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=let+me+love+you+one+more+time
    • 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_off0000ea67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 16792 bytes
font_01_sfnt_off00010279.bin
c061289494796057cdd8acc652a169d3f8ec2d47c178f93f82ef4297f52b09e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 17000 bytes
font_02_sfnt_off00012ee1.bin
9f2e310bd28e1e7f1679c899466975554775f79a1a1e3a72701b06b36d3ada15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE1 10176 bytes

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