Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cdaa070e883760…

MALICIOUS

PDF

91.4 KB Created: 2021-07-03 04:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 526b62f8efcb286e19d1aa3394266943 SHA-1: d2c94a3e6ff19761a32d198a0444e82ca91c25a6 SHA-256: c1cdaa070e883760f6e11150914e66ca35e03d72795f4781481ac67bc23f0718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm or redirects users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=chapter+7+it+essentials+exam+answers
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb784081f---viwowol.pdf
    • https://miet.hu/kepek/bawitutusopixunivoroli.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623021300678753.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/290c6a0b9a7693d5f33cfe27170ae712/vezelopumafakusito.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sasazipepigod.pdf
    • http://aaykpn.com/uploads/editor/files/58538614986.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b58e3c685608b7cfba927a61a2d12c27/dotop.pdf
    • http://maxidmum.com/images/upload/fck/file/86497883920.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/c7bdef8c63f2ffa1a0504701116a6f6a/loranoxekutubovapavaj.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a2d6b94337ef76a6921564411f6646b1/kuzipopudejagesezesiduwox.pdf
    • http://venusland.vn/app/webroot/img/files/rewirulupud.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72067b879e---22168830108.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8925ee591a---zavowukuneduloresuxer.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c967935e36a---tobotaromaseleno.pdf
    • http://lhsclassof68.com/clients/73441/File/tisomepabogaxedoziwine.pdf
    • http://kantoromega.pl/userfiles/file/lemamudujuganod.pdf
    • http://pphu-joanna.pl/fckpliki/file/78256068601.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cae3d97e667a93da0d3dc29f2b6c93a0/29905470511.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010361.bin
7e24df78d409f163af3480506a9624f0e9831491dae1ac92d27189b84d3e4c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16684 bytes
font_01_sfnt_off00012ec3.bin
13277bb95040d6522d8968395a96f02351a4e6853214f876f72c48f7135d3a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 10664 bytes
font_02_sfnt_off00014728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14728 16792 bytes

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