Malicious PDF — malware analysis report

Static analysis result for SHA-256 da96342a188be6fe…

MALICIOUS

PDF

88.4 KB Created: 2021-07-16 19:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc01be69e9d571c1213d1dca8296a0b1 SHA-1: bb0d673f5c4b2fbeb22396def6f9b4eb5a445732 SHA-256: da96342a188be6fef30af43f7dd863c696596ebd3bb63f80b9063c006192bc30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics and ML classifiers strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves tricking users into clicking links that lead to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcebc2b8b---74027608374.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073375483511---1656755331.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9286e8a4---zomudigotupaforokivujuwi.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/86064027375.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/72183105800.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/laecjegcj9n2g208en3ai4q12r/42654368024.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ce1280b2---rijomajusapoxizefirobosax.pdfIn PDF document text
    • https://abeess.com/userfiles/file/72601994422.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f9e3c308ccfb2e5bc0fbd40e5a74bf7c/4535831069.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulaaa0kddjgmhhb7nrsbeo90q1/fogogakejubomo.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/16147682544.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/817f3939ac33d130eddba63acd35ae8b/17435820946.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f8eaa1d18---vexerofujesefubofopajez.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/v7gvq9fa91jpr37kid7597rsg3/15198201943.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607756424183b---nexajuwaxax.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5e02f4417cd6254a41858a452645c3fa/64994729851.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95400b152c---81725896375.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tcag40li8ninrj7ilblp85sc5k/65829153538.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/sovajazukabebarimulor.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/karagel.pdfIn PDF document text
    • http://abwva.com/uploads/files/61897147446.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/nisubodidejulajiwudax.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcee8265b8---gebomifago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=bounce+out+onlinePDF 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_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 9944 bytes
SHA-256: 56d7c7b766cdc45975541dc11d7088bc04e79fcdc06c50a34ba246ec1b6a0638
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 17264 bytes
SHA-256: 4a34d22427e610288ceca4f5b5022009e148a25116b73ec307e9dfb2e828e5af

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