Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fec461badbe644…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 15:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05e29de5cb149e32bc31255093bef840 SHA-1: 9f68052cef29c9058eeca81d95dd61054703334f SHA-256: a9fec461badbe64438811b57e21ed4078783ab7e250ca8397718b41cabe7da96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=butterfly+whole+chicken PDF link annotation
    • http://glina-master.ru/admin/ckfinder/userfiles/files/valof.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/wixijijima.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107211223427556.pdfIn PDF document text
    • http://qdjshg.com/files/file/7101079567.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefababofifibozebe.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/joxebegumon.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/66899519378.pdfIn PDF document text
    • http://grimastone.ru/files/begid.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc3c73e3d5fcd3b17f900db7a17660cc/votamagikepuneruvevizo.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/migenob.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff80ddb2bb---vogijunasuzifowisalobux.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/keserumipidu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/65926024967.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/23445227721.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/20486766993.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/dagipijefapevutoru.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1082e3bebf---buzijomisavalojebitabutox.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/fp3iob5m5oodldlutrimihh8nh/69034096331.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/39907212234.pdfIn PDF document text
    • http://msiutilities.biz/documents/gevobamufuz.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/merepovudopezanajifu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/kazubofegodigafiluwap.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/tosefarasowunid.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c88c2fcb---zafuriluzidaxekisig.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0ee37632---73539573180.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_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 18548 bytes
SHA-256: 43c5b54d046bac61b2b7201b8bd3b0cea48c505effb64d8ea7c0dfe12e5b1015
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10548 bytes
SHA-256: cf60987741365a4ef525e215c228b7ec3dfee721646d0c4f454f93c0f01ab78d
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.