Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f7db6af4dabd72…

MALICIOUS

PDF

67.4 KB Created: 2021-10-08 00:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 266effee7ea6e1647799c41c10fc7ce0 SHA-1: c369eebbbae308e4fc9f1f81f98bef8c05aa043e SHA-256: f0f7db6af4dabd7239b1ce31320874487baabd4dec6a93d4e262322e04849fb9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification, likely as a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=barley+is+good+for PDF link annotation
    • https://elmawadah.com/userfiles/file/17619440250.pdfIn PDF document text
    • http://getem.pl/files/file/dadabubonunofezidefupuf.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sadasopojatajupovemufo.pdfIn PDF document text
    • https://majubesar.info/contents/files/zesabugiwebafoxenogezu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/suxetuxaji.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/89678729725.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/31300257792.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/bemixozedewib.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/68337412526.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/87642169080.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/92658278940.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06ed7de12---86088066557.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/lotorakojolepanedir.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/lufujejuf.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/97118245044.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/72825023234.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/lopedesip.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/20173490463.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/zojuzubizokitobewudefivab.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a14a0bfe4---vajuvu.pdfIn PDF document text
    • https://buzyhub.com/files/xebarekobix.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16150b6ca9bf86---juweragulolu.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikekuvuvobelomokusasafi.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_off0000aeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB9 13804 bytes
SHA-256: 9d6835d02b4ef165e6c78107af279bdc13912c78eefc11b26b19c4b51999db0c
font_01_sfnt_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 10496 bytes
SHA-256: 083e74eed55cba067f13f41fd9567794a1956d3718964dd85096190a9337f790
font_02_sfnt_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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