Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad6583970a83a4e…

MALICIOUS

PDF

131.5 KB Created: 2021-07-26 11:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ab79f3138753913b1d9e4eaa81c36dde SHA-1: c533ec679441cc59e3dfc1fb13186767f7a00983 SHA-256: cad6583970a83a4e68bf67845fa7b100be656801523d39f19e751f4adb39b71f
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting and compromised CMS upload directories suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb29b497bb---7503597579.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/a0b21d60a1cae8f208ca28d2e2ce10d4/teleresofav.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/61740018718.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e6b1bce5---37143212680.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zobogirefuv.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/76513154214.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/nawojerosikod.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/31312838682.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8aaf61a81---kimetabik.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4e614ad2f93650c2ea8a0444d445ead/59576757272.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba51c64a61---gixewemigufapomokifawi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d4f2ea0b2---15929170104.pdfIn PDF document text
    • https://jagominum.com/contents//files/nodolujulagozif.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/85619555779.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6700a7a90b21c9464595c02f6643652b/boseg.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/88885153045.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087202a72fd9---22816561466.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/54813d78fb0af0fe084d9fd300925a5a/12215554174.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/serepozikixafowutigoda.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/825667727cc46917237c4cd3ffd7de4a/27972740203.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b35cb705d2f8ee6e592200fb8fdeebc5/27386504884.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/0dtctriodbmqf0i01vsojpbep9/53905178855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=google+scholar+h+index+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D2C 10860 bytes
SHA-256: fcb94cf16c63f4eeede4a83e8c5a98d8f5420e7263928c537030c25633076178
font_01_sfnt_off0001b5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDF3 18888 bytes
SHA-256: 4e7d606e9db4cdd82b8c3ee7925ec8e35063b71665335f7aa137d17f06caf8a0

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