Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74c5356f06faab2…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 04:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cd93ac9d303a5072a6e0d103595cb1e SHA-1: 91963c9458445f547507b1c1f52800b31ab29182 SHA-256: b74c5356f06faab2449951a492bb60adb5c298160e9544dd7f84ce6a585d10a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing or trojan delivery mechanism. The presence of a 'download button' heuristic further supports the lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/52f864ec027244d489ba814f72d1b895/10882127002.pdf In PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce10dcd127---55671930936.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/togopamigedutuxugusebe.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f48901112---fobotononamemubefebo.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/damesatujopener.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fee26663---zigukiwopu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f8f7d628---5000152604.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1759b7ff97df6089e34831d0aed3aff2/tifug.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/85639253617.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4363474ea7---42671866326.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621194665.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/jenipsgo2jssufkpf75rkle4r4/tumokobajufevobo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/11062123201.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/phq6pndl6bf1n8cq5l1gima3la/74662447261.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jujulelijajunew.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/91368866d7e992b97a0d5f364a126ac4/9586975059.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/33830d190bd5bca8d706facfa79e5b39/kafidowotejonuput.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/mafitajogugoguxuzuzewa.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2a72efe7---23402777201.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda3396c34---viguporufosetilim.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ja47nce5qk8fdlpr6s180lvdt1/95227526854.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6f802c50c---19218838546.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7f4409979c7710ee73ddc37939bc9f13/siropemegetilo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/26d7844f57ad2fec3b49e8dc84bcc17b/minagabaxukugedirajo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ad7c6b730a513b8687e3078449786cb0/zubozejedonogevugoxade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=overtime+calculation+excel+sheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 17584 bytes
SHA-256: d59976cb65b94ba11d6e576fc33abdba0d85521e3db0443a239ec092b3bf3769
font_01_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 10788 bytes
SHA-256: 5f0402117b20d05b287254085d300e7407991db4f9355fe1441b6f0c58d45365
font_02_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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