Malicious PDF — malware analysis report

Static analysis result for SHA-256 052f76433f6097ae…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 19:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c607337f6934f4d618d429d60602658 SHA-1: 8ce182ed15243122823bdfcfe0c5e1e27b9a295e SHA-256: 052f76433f6097ae4287f534440796101db2f18b18d951b3c07063cb8b2a7ebe
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://crewmak.ru/uplcv?utm_term=calculus+series+tests PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b4143e37---18915484523.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/rigalesedeba.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/zonixodokofujodala.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a3fb7f0faaf17729af65825496c7bc92/3206935672.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad73cdae0---93077170789.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/23775119523.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/39216d98dbe70d1380453a279444fc16/32712387087.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/23408635052.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/62321411156.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s3lhmjlf8ht03gm2t7r0lb1q02/vabuwu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/81780ffbb69aa6844b0efa2f09094640/44242905812.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dufonovikolane.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/14663472007.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/joredes.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/56469828780.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb9a7d1a9---95060741955.pdfIn PDF document text
    • https://norservis.com/files/files/rejibimor.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1b37cbdcf3a5b6fbf32ae3b950aebe49/sadoxafezupower.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/82372296317.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/31374243038.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ebf57d9e---zomovozis.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847e49863b---8167210883.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160793996da177---58192620964.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/51176599555.pdfIn PDF document text
    • http://isgsrl.it/images/file/744246383.pdfIn PDF document text
    • 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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 10132 bytes
SHA-256: f41cc0528ec4b5ce21b9129e36a3d4b3488ef998975d6df2cd41323c4e9a8470
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 19840 bytes
SHA-256: 0da5bcf1058179cb8502045723774b7c644e21cf08a4b377f3bf0232387bb2bb

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