Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07db5f38a8aa75d…

MALICIOUS

PDF

82.7 KB Created: 2021-08-15 22:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 02b21081a5745bb592e53eac2cbc24d6 SHA-1: 530e95c92eeef967de5183611a5da21781032e22 SHA-256: d07db5f38a8aa75d263222cfd7bd67d6cd8bcd782c166a1a324eac4b747becc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this, indicating a likely phishing or malware distribution scheme.

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://xn--80apefbdm9ah5g.xn--p1ai/userfiles/75738627210.pdf In PDF document text
    • http://debseven.net/UserFiles/File/58478928524.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/vopubudeketajojogedirak.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tigoje.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c972438f843---56367702303.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/78044017700.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/04470acebe55e5d42f5d39ff7f0a8c34/11732518202.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc49b55672---mobagarasunozi.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/ximegoruwebula.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c500260a8---kinugakubogomipok.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/rofosabogagufotesexo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f3f93fe8f---14185240596.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/novagegigebuzit.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/293279071.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609647a611a7d---19293950354.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/59924632878.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f01168c862---32629208535.pdfIn PDF document text
    • http://www.heksan.com.pl/file/sixunekodujekuvix.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/8725194720.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/5033853149.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/lixusak.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/26300731453.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/kasux.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/91742149749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=roblox+song+codes+stranger+thingsPDF 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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 18772 bytes
SHA-256: 4eb17e36a75aa2a61b3ad7635e9e7b9872039bfd59e6b39a2037ca13f61aa43e
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 10936 bytes
SHA-256: 2617fd8427a732bcd778222b1278391471149f3b80eed1428bf8376950cdcbee

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