Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1154c961c2ca48…

MALICIOUS

PDF

102.7 KB Created: 2021-07-24 02:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a27f6b98c8347b1b5fb1166a3fd76401 SHA-1: 14cf4df287a9fcf8a2b3635ab6237c2d0993d657 SHA-256: cc1154c961c2ca482c0f72f6ea0e60ad5515aa4dd321d46a528d1c0a9c6bb19d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081033aef8f8---sukisasejoxofufofofufu.pdf In PDF document text
    • http://asea-admin.com/_userfiles/file/20210511183613.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/526f98kgahco8b791tjgccc2e3/doguwekobonixajeweko.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb8910e42---dabufivodimokiwarazakisa.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vugiwelogimunezoza.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b15e3fbe7bb35b57e9f100d9519df829/41172180261.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/92552793189.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/46272144244.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842aef28589---kisipusiregizobepobi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a67d5c78bfde7867147ff3b37e57bbf/suxizon.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9e8f46df2---63301148552.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/54711326649.pdfIn PDF document text
    • http://cloverdiamond.com/file/ferovola.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fa7e61e4dccf55e53d6f36e0494e7748/28258706987.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a18eec6fe---bomemefafasusutofubogu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772f352a4a1---90981547900.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/5cc3a7dabc5af15b1264b91e57de3960/jigidupubekogipaxiwoxinu.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zevatiliwokotuzu.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/jenisewiwuzu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607025542a7a9---sixodojavenaluv.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4aff50a3f52053526dc40429f826d1ef/maruwuwutebuxadobipes.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/79638417151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hack+version+of+free+fire+for+androidPDF 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10472 bytes
SHA-256: 0946b97641e916a374921bef9d771b7684a94ef77083e23bbeb19bc535421870
font_01_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 952 bytes
SHA-256: 08db45c348b042e5b6543e4ded476fd90fdf5dbe5fa207d19202d8b4f408f94b
font_02_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 23164 bytes
SHA-256: 2a5ca123098370d3b5b7156c9359add21c3d2b55ec9e721f7c96c9922e848dd1
font_04_sfnt_off00016a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A12 2364 bytes
SHA-256: e3b1d35896eb4ec76b8beef564d1d2b21bc5bc01104ba1b64f4b3d6c24f02f8f
font_05_sfnt_off0001748e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1748E 16084 bytes
SHA-256: 94556d17524a42fcc3c6ae644b74ccd2511ffebee32112b0c6c03ae652625754

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