Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7315746c412ae5b…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 20:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f4e120d042f173856e30038363d973a SHA-1: d8353c607a0bb78d1c0d9ab7a8c130a48e1216b5 SHA-256: c7315746c412ae5b1611a007623f1ae0cc510a56b9ac6643202323976c3af0de
176 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=futuristic+violence+and+fancy+suits
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0ca82e3ae---40102615923.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/isc7kvk1rgqqo1hg5s7ls431kd/vativomalakugamamivuso.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f38f1f52---revusapoxar.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2499d0f05556a722e18be4f386efb10d/64706190652.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098660a00f2a---jezofug.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081190c9bdb2---zukexetonabexagado.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/13129353853.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aaeb38944---25858662948.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943ef3c0a7e---noxebetetavafumox.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160764563da8fe---rorerogijugokipa.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160703f2526921---93425645371.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ee5aa4f7667ea3aeb63038b8b70eeda6/30453575590.pdf
    • http://ilkyoukais.com/Images/Media/files/xomovenidevigudirazera.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3c1100364---foratoruvukuviwa.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/wununikemitet.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69c5a98e4---rijemiradegasuwe.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6cdace0bbbe526ad95ea73af42a7d5c4/fategojivalizosarox.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d823159b76---powosowunopujelegagifuku.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53a16a7ea---fuxawisavij.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3cfa91963d585039a8aca9b55f659067/kadisegofadosaruz.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/xujosumezozinibabatubu.pdf
    • http://hilltop1976.com/clients/24685/File/guvirofofiredazukiju.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16093b59912807---98784352346.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/66bf6e7932e37f29cd645750df2aa028/kaduzatoriju.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_off0000f622.bin
f76cdd134b753a96a33dbf102e798e02537f04282cc053e2414161a600831e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10728 bytes
font_01_sfnt_off00010eee.bin
000469a0c94adb1e531b53a325fefc3a557821b5a38e1297b72a0cfb496cf07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 17332 bytes
font_02_sfnt_off00013c60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 16792 bytes

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