Malicious PDF — malware analysis report

Static analysis result for SHA-256 7372eb6b7ad56145…

MALICIOUS

PDF

92.0 KB Created: 2021-06-26 16:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 188888eb99a266999f511d1f5ee48321 SHA-1: aafda02bf3d464f753b79b3cda118f978a7a08bc SHA-256: 7372eb6b7ad561456e1a91ada0645fa015aebbbff92f3bc9a4f2ec248239d7e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or redirection mechanism. The presence of external URIs and the nature of the detected heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609257470d330---82114228788.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/vaxubefudokudurir.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/caa450b094e8fe746393d8d3544e27ad/83741618798.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/30614461163.pdf
    • https://dakhoathienhoa.net/images/files/94846013701.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/965c1d4ee638c32819e34e3025aa9f07/dezozabenamepejizuse.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d472d7d48---kokarawolitasiwanitusibit.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb608b686d4---gosijuvaxifuzafufipibap.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbdf5ba4e---didafopoxodesosimo.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/731f4fbee5341acd2abac0e085bf533d/lowuzugugafemijoloz.pdf
    • https://rmp-traueranzeigen.de/cms/files/xepafadamojosa.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160885738d67c2---12856021585.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821664e9256---99126301073.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1j44snof3vma6pkoh7i79q7d2j/jokimugosapakegogiromob.pdf
    • http://bobiniauto.com/userfiles/file/levekuvinofide.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9a041926e3d2eab7bc1bee27026a8bd7/tovufizomibadajusojana.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965789acbc7---dosafemazorazifizisizeg.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713c8802ac9---teged.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090057c148af---vipab.pdf
    • http://alpha-cp.com/userfiles/file/88411421904.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c9a0ed07---86255108862.pdf
    • http://asremajazi.com/uploads/files/zabefilesaze.pdf
    • https://bczenekar.hu/files/file/bukipagofefevo.pdf
    • https://dalton-english.com/userfiles/file/22514385175.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2333430f---xerivobibivapaxenevij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=manual+call+point+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_off0000f6f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
font_01_sfnt_off00010f08.bin
e9081255e8d1f2c5b1a6bbb92bc438241bb04df0a5c9c3f128832a447e7402c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 10308 bytes
font_02_sfnt_off00012650.bin
9562cb454298760b8471f70d162129bb78d4e085b27bacd4a08c0c772a810b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 29468 bytes

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