Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d9d57e7fcd069d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 07:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdf858d1b0643787e75ec2a9d298ab61 SHA-1: 3cc1dfe1d2ecbbb30fd84ca4d262d5045c69281f SHA-256: 08d9d57e7fcd069d5e3892f76fe03d19f5922106e5d1126cfbf4945bbb2d8a22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or scam campaign. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=free+blank+promissory+note+pdf PDF link annotation
    • http://songhakbbq.com/uploads/files/rasazezeturomenebidig.pdfIn PDF document text
    • http://konberdbio.com/upload/files/48267982626.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161013f0153f77---52881212520.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/45fd91966fc834d2aaf991ee4d06a680/tagojamomuxenakegeza.pdfIn PDF document text
    • https://edarky.net/data/file/rewimuveg.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/bcba4a336b889f1b8b5eadd925a592f2/82148645093.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/r51a9vv3t6l8jv3fu3dfiaedjd/7252814304.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/sumatafugikilud.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/82375391570.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/geziwikurevobuv.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/vuradekuxix.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k4omdal17ios253a45vbg9laip/80348946908.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/33769093639.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/97739339880.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021043002002273499.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/ziduvuwabuziwodetete.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/7656117544.pdfIn PDF document text
    • http://moristas.com/userfiles/files/28070288420.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6513c9d9ff33087450d2cd280705feee/nedafunudoro.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tizalukomajakumox.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/xulema.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/budovuzunaw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/i5qn0i6vmt2jd8v166jna6968n/rererugu.pdfIn PDF document text
    • http://eventechsite.com/files/files/13313098812.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/o5mvs46k9mmu9i212m4g0qkktv/pevapo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561e66095ea3ccd4ca24e03121a25537/mubavoro.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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 10980 bytes
SHA-256: 8eb37ab1117cf289dc8143038e1292481353f6f749e15b6a943804f07c161a58
font_01_sfnt_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 17872 bytes
SHA-256: 2d5a9c9442e3e78012f8e7a6180c8bcdd028f55cd0f95ca3ec7faca48c8add40

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