Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2b0db6351ad3c1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-25 21:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37a25485adbae14dae0e98d46198bd73 SHA-1: 62839f072bb3b1930cc9bdd075ada69d5b3c0c90 SHA-256: 9c2b0db6351ad3c112452587e6412fd33dddd4f6fdaffe7f977bc9d7d24078fe
156 Risk Score

Malware Insights

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

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, directing users to various URLs hosted on compromised CMS uploads and disposable domains. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule strongly suggest 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 http://weifong.tw/fckimages/file/sezifumisowapo.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcce78d13---71961351893.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c048bec2dfe---11196955367.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/fivoxora.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/s482h3vtl76dji3r12fai3b2i5/35472429590.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/zalorol.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/serebogemotorurojufiki.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cee770630d6---kolepikavokezi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf048113f5---lozogawivito.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160819f90883ec---bonujadoxutesogelivixop.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gegvsef9lnn36vjqe37op268km/14629050231.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e429139ccf---jonanatorodofelodup.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceee6e0c47---guxananuxidoz.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fa150957655e3b4e58f35cb253dc6499/mogenedobit.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b5043d7f6301d9703ee978274359b8e7/japutomepomenige.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210612105708.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081352c581fd---91411486513.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a222a399e59---tabakonelekenujefavawudo.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/tadedafutaronejurap.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/sizuwaneseva.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/18d9a91a4fb673c0ca38272c2bac1aef/67092119090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+de+funcion+lineal+y+afin+para+resolverPDF 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_off0000ea89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 10908 bytes
SHA-256: a6be2d113d612291672ea94cd485b2c063734eece7171dbbbc330f4520d8033a
font_02_sfnt_off00011bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEE 17692 bytes
SHA-256: 97d7b8ce00771f947cf4af281f79b0b9257cf3745a2b223c7f9ceb7feb22802a

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