Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2fd94bdf75758b…

MALICIOUS

PDF

84.5 KB Created: 2021-08-02 10:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f851cb4d6e09044237f7b9bb7e305d1d SHA-1: edc76addea0995a781dbf238f7e6b9635412c831 SHA-256: cc2fd94bdf75758bad39bb10a73757d3d6550303c04a00fed1cb6f2855d85ce6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wastran.ru/uplcv?utm_term=how+to+make+wh+questions+in+present+continuous PDF link annotation
    • https://ancoraeducacion.com/images/wujis.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5bb70c35---56992728492.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xipivik.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/16902635fd4019880ad4825281e6e4b4/zovapowasokojubuzuzuja.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84690ab87---68593084998.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746894dfa64---36107758470.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4c11adba004d07d0e92334e493568648/63073229928.pdfIn PDF document text
    • http://citranco.com/users/files/dezalok.pdfIn PDF document text
    • https://kristinanamaste.eu/files/1016094834.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6f46b336a404c0a676ee73972ace4e06/91532433850.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/nikijepijevodidegepe.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/95761279363.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/xilunilexegarafe.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088a509e2f6c---8473724955.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707901f0985---67670745261.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lisexusokudubananorul.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab256f95c---15573252243.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cec41b1a4---67931649474.pdfIn PDF document text
    • https://nasikampung.info/contents//files/kenowakiwusisijeze.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/taxejubufu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/katofalapevokite.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc722cf531---rituberaxotajipow.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162735920796263925868.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/klpr1s1slgf4kb6lji68h6m3u6/zobolanilosokimadojuzo.pdfIn 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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 17528 bytes
SHA-256: a1dc7f8d15f138e06d65b5ab7e4be2badd97fba32b9e0906dbce89494dc95a04
font_02_sfnt_off00013471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 11008 bytes
SHA-256: ddc09a33a77c9ac3f5ee9b85e6dc4b208240092b96bdde53e9892da68cb93657

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