Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec37b581e8d7fed…

MALICIOUS

PDF

95.8 KB Created: 2021-07-08 07:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a7fce9952adfa2d00627f5528c57e538 SHA-1: d7a0bb413c4492d644dd3b8afa979b6210264624 SHA-256: dec37b581e8d7fed32023273feebd5096e9f4a62c2527c31c7f3cabe128f0664
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and link farm behavior are consistent with phishing lures or attempts to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chunmianxian.com/upfolder/e/files/20210624214140.pdf In PDF document text
    • https://andrejc.si/files/file/77364929193.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921a4622aee---jemox.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/10020060267.pdfIn PDF document text
    • http://apcmagon.com/userfiles/98034610346.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3004916b2---jazizexafiwexapibenulitug.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608831e5cbb52---gifajexiwimokofoj.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/74e489e8468fd8bb9ab26c5f00bf8dc8/dajugilized.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kg2ll777lhi7hluo2ua3f5ld77/sajesilukim.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/70951443602.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a86a4d72c0e---vubekijutugomutudamawox.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e5778271---38644039310.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a6aff7b4c2984788678e30c64898ead5/92787975790.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/55681123818.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gavozutitevitetawaxivazi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3ff448a9f6d3ede9ff55510062a6ca32/nilodiradolelo.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/zasadifizedivaguzufeve.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/16315386510.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/dbab6bb2ab2535515419ac64a8c3e60a/vetogofos.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/761bac4027908d6d42b8266f1c52c564/maguxitenuduv.pdfIn PDF document text
    • http://teresachild.com/upload/files/77671903706.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaad34958d---5985370398.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/189d6bd2beecdc25f8f62282c6efe74c/tovusopinuguzanebi.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/kinije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=communicative+constitution+of+organizations+theoryPDF 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_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 11108 bytes
SHA-256: a54499a2426da37a66adf9adabf801f4fdbea589ae6b0cba0296c75cf9474194
font_01_sfnt_off00012b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0F 17896 bytes
SHA-256: 1cfd8f5075d633125f72e7f88bc4ca15e6b96a6b7e98ea51f90d67f0d7b9fefa
font_02_sfnt_off0001598e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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