Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3ef274bacf2385…

MALICIOUS

PDF

95.9 KB Created: 2021-09-01 13:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d808c52d8a0f6e61fdf3acd547b9364f SHA-1: 70a9c22dfed691778486c4c7ca8bc15d1e7b5ba9 SHA-256: 8f3ef274bacf2385f23df86d793d1464e047afe2d602684a2f4d8bdd1ab67c60
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The presence of multiple external URIs and link farm indicators suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://canvangdientu.com/images/file/duzezufezovesogu.pdf In PDF document text
    • https://qnzar.com/files/1999013095.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7hjflp0sj3rs7kaefdlp3nu7va/nijenufetik.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/18259970346.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/99799488827.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mazeb.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zufalokuzo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61314c50f---46355248481.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21e0b2906f---zebifolisose.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/jevixepivepurapopituxe.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/9085530707.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/38123897069.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • http://chikatere.com/Upload/files/41388633972.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/b09dff0deae0669934732c7573456cfc/44630954556.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/75732301348.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qj77ot8iqf7mtfgd0pso1kishn/farasewedijavudo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qunoegqijk9h549jp38hh5ichj/jajitazujamegaparumab.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/lobasomijolog.pdfIn PDF document text
    • https://edarky.net/data/file/72038287902.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/01e8a99b05534f3e043c77d7e37be6af/84794874922.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a5d0d0be72ce79a85943b9137bcd3520/nurutaxubo.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/zubafovagonaganiseras.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/174623871160f34979ce839.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/83724617735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pictures+of+logos+quiz+answersPDF 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_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 17628 bytes
SHA-256: 68214ce7fab808ccc5684be4b153217ae867c2c25ec0de43e83a7324cc1f07af
font_01_sfnt_off00014038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14038 10904 bytes
SHA-256: c55f698fe1a94433ec81635658b7e5463f2cf13014084233c14d7026b9e4b609
font_02_sfnt_off00015972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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