Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bb39278c77fb66…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 21:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9b06aa3f82d69cc11144baac63e2192 SHA-1: 24e2e5055dab1bdda8b796e027871bf20439e2ce SHA-256: 71bb39278c77fb6663ac9803067da8958997e2055fb48ed764ab109a925a842e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing pages or further malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://dokumsuzgec.com/userfiles/files/54988253738.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/86fbf4075759bb265fe8db7e4ce7ed17/64120716508.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/zozotidopojawojaji.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0250c89cc8d495ef6679c6350f50c5cc/rulavetemifa.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160832767899b7---koxapuzipiva.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/junepupifovelesi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/77fbb302dce5f34b1b6619be3108a2fb/87677770712.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xirugowawagivotetusi.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/27817252732.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pothb61mc0k6qevis7evq9n2p/71385430375.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/28b7f1df1f43544bd964e2c07eed3ef9/87564248623.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/75584924685.pdfIn PDF document text
    • http://edgecs.net/documents/dimudasaketemixosevi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9b2f723fc9ea0e2c02040340bcb3e18c/kekuroxosidojalajo.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/wuboxijav.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/66005141901.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tqkbpqrr82bnku26kidbckjaln/jafevoxerusil.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/32086343304.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/27e8e73c52bfd219837646a1549acb1c/33249621492.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/20d192d45d9bef4bce1e4f7ea636c536/bivitadifuvow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=angle+of+elevation+and+depression+worksheet+%28cont.%29PDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 11348 bytes
SHA-256: fc0ac73f4a886a75125e8dadb85159927c0ba4841c1840b36bd1d5e1d9cf7835
font_02_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 18556 bytes
SHA-256: 4530da09824beaf4e2371f9357efd6d17331aca870b5206734b11fc4c9fc5a40

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