Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e7cd370ce9c422…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 09:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34d67e46495107da3cf7bcb89d2b8bd5 SHA-1: 95b6e98b00b0739bfcc22a3d713bc326e6a23f5b SHA-256: a1e7cd370ce9c4228d5ff6ddd18619059df758c6ea74d93d6a98de1ce26fb7b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=heart+failure+american+heart+association+pdf PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4c2ebedfc---wuloxalura.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/41502402275.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/86126398125.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210717101202.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/fagupokirul.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/81995473129.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/60218693033.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/qg00n9k5q20ej7ac93ti8uudih/59632314016.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b182a81576c---71295404892.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/juradirobuvasimijapenal.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d67032bfb06c2ae1c9dfbc526cefdb76/43676351218.pdfIn PDF document text
    • http://mousike.it/img_ins/files/tizegevinevepiv.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/94010445678.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c57dceb0a28---74305919416.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/dunediloxi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/wosisuzanafumoromejiwoji.pdfIn PDF document text
    • http://amandamaitland.com/images/file/35553953889.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708244bb52c---30907663817.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/934828509.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/70748899310.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/firefekanu.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/52089055917.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/tavarupedoluvoj.pdfIn PDF document text
    • https://www.espaciocultivarte.com/ckfinder/userfiles/files/jurogugevenonak.pdfIn PDF document text
    • 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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 17136 bytes
SHA-256: 4ea22525714a4ca72db57d7a003cbdcd10b3cf433ec1b9a0226dff482c899924
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 10976 bytes
SHA-256: 0b56b3290b5d80affb1db3ba1bbf5a1f92bd55911904a4b0eda10e70cd6024c8

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