Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4112eed083da526…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 22:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75255e3efb71f9f208295094383bc731 SHA-1: 727a66819808c21eb6123034342856c7e94a1943 SHA-256: a4112eed083da526c6d6614f05b0d2c34320c2202ec78f93694839d49d6c9e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised CMS upload directory. The document body is unreadable, but the presence of numerous URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

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://lombardpruszkow.pl/local/userfiles/file/34017237421.pdf In PDF document text
    • http://bio86.fr/userfiles/fichiers/tuzobupapus.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1ff3ce2b---63058464194.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/72727627420.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/53632737996.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69950938162.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1gqanftbq23duiigr5tfenivoi/xegivupemipotina.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/85284161091.pdfIn PDF document text
    • https://grouptm2.com/contents/files/pefenodipimigono.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/xamavosu.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/vetuligabofadakerezanotil.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/botimarudunugige.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6b07d34f---kafimemajubexadigofipemot.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/66074883110.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/dipisof.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/lisikasuzemanelififitol.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/wonuvuwelopavovuk.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/togogurunesazadimopunaju.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/38900808890.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/20823259215.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109050453253968.pdfIn PDF document text
    • http://www.toptehnik.si/images/62068259503.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/58932155614.pdfIn PDF document text
    • http://szjg.hu/images/file/37328214570.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9898749dd---75486199491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=contour+line+art+examplesPDF 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_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10648 bytes
SHA-256: 681739564cab423a75882ee14e1bb7b7a6fe530ddbfd77e89e1890a066e839ba
font_02_sfnt_off000113a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 17680 bytes
SHA-256: 30ba781371a75dcfd6e67dc9d0e003433f63357d03ff2bc27ea0a3fa43b3dfb3

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