Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7073b56c69d9dbf…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 14:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9d9ce76e2265153aa0729cac2781a7e SHA-1: 65832c3a3b9bdb0e7b0545554f94d3bb821584db SHA-256: b7073b56c69d9dbff7b8fcb94dc90d018700e0dd05cbb0f2259accf1bf23ab39
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=applied+economics+book+pdf+free+download PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4e864a59fb22b2f47ca48f59d54c8271/finipanituki.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b7fbbfd8215d3dd4c859d08742d1b1b2/69519665943.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/zixoxofob.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/nutegetutinew.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/zosumefabovafedebekax.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/27346275289.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/68686464167.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481414483f---17546413127.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bed8e069---gunani.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/33391104864.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/99627004864.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607edef424ff6---rizefanixajewepetumomekof.pdfIn PDF document text
    • http://emannsltd.com/userfiles/tawekulozimunobubufori.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3b1eb7ea---74098489331.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/67576222180.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/99024243594.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/96066546441.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/bawibagojosi.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/89641942116.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wojadolubitejipefafu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e06b803a7---82331453353.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/logit.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d121a09d---18944787522.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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 10980 bytes
SHA-256: 14c88fd9d75683a7b7119a7e5a9d55283a344cf5986e6d8a2c819f8c1c9dd2d0
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 18056 bytes
SHA-256: bf85ce46f7605aaae4c7f72d145e6ea0334e7ce29c2653127f86b580f80cc83d
font_02_sfnt_off00012ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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