Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa412c7c4100ec11…

MALICIOUS

PDF

74.6 KB Created: 2021-10-05 02:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b2459db512da9cdf3887b1ad479dca05 SHA-1: ddcc820d4562ef7ed996c9ac5773d9c2bda0512b SHA-256: aa412c7c4100ec11cd4cbcae31b4c4b4dee865c33a801cfc6895014285b63b43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://oniceh.ru/uplcv?utm_term=height+weight+chart+female+by+age PDF link annotation
    • http://haozuowenwang.com/imagefiles/file/xawafifugukalupum.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/jarof.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/27199997189.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/kosabenejaxepalexomus.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151c1a3a554d---wazorajevedife.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/3868088709.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zomagefejoso.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/12931123281.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/lagabaxeronukususogavifat.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sawobadiwodoxujib.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/wedazekigekesuz.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302231636a7---xuzojezuteneg.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/64823250238.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/mijajigovifegewesav.pdfIn PDF document text
    • http://www.bash.cl/media/file/piwarewulepibakav.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/xebibuwixonat.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/97648178075.pdfIn PDF document text
    • http://tyextractor.com/d/files/76409941865.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/penugufu.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/kiwugar.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xobexujivezigemotuzukab.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/40018685452.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/tajazixowumalewom.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/94649669087.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be874c1216---44896771587.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e984852dd8---13025729085.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/buwelubelitenixizateni.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_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 16252 bytes
SHA-256: 23c1b6e76eec18cde888e31a26b1f701ee09a5ea49c67426560f29e4671cbde6
font_01_sfnt_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 10720 bytes
SHA-256: 0b90efe078aec57a6e356b20ed53a98dd096a68a95a569274dc4b832f9ab5c72
font_02_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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