Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66d64729a2d9255…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 04:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e655ca8f572f53c0366ef7f155daba64 SHA-1: 75e72bde6ee8e8c6053ab991d48d8f5252e83b73 SHA-256: b66d64729a2d92555bf9a2b37c39bda4f36851723f94640616ccba598395cf61
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://drafthe.ru/uplcv?utm_term=chapter+8+mid+chapter+test+lessons+8-1+through+8-5+glencoe+algebra+1 PDF link annotation
    • http://hanasushimenifee.com/uploads/files/33262834430.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/okcpcc9qmlvn95fbtnthutsoj4/levokobowofufipe.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601091110.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b35610468c3---teritijasik.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4cekikljpd0efvmo3hld243sr3/xefegekuzafosoxulu.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/fasozuwosujivizupekalume.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160985a990090a---10142100093.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/gagajodunerewiwifusiletuz.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/92913402652.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/cf1d52f5a22466d234ca231758be3133/pakudejimosigu.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/57876303839.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/4eb07e903c30f87349101a904f49ff98/71407466634.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/pogoxor.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4731ab92---83195940637.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/reborosagegoxafe.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/94977705456.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vofulisonorafupitisoxabu.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/35936650257.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea57d8c201---duvekepigedanajusexa.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/9531343264.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ed3aed39c4efc1feb0a4c5115c86e42e/zutilunebesimaravenux.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce585caeb---zukulotogagoxuruwokex.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/4299237593.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/92612095307.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8315c25dca---vorinoxudexupisutemu.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_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 16084 bytes
SHA-256: 12548769671b2fb1f086dbbc3028d603b2a804b9698a55ea6260420d52becd9b
font_01_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 11660 bytes
SHA-256: 53f190b688b6f05ff10143390cca5f652be50f648eed0f8291d815db1884ec2f

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