Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be7783d7678258e…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 13:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fff1d21be1b3b50b14984ec7852e7743 SHA-1: 171174395e70fa1874efe2b7d58d1f97e7cd6a75 SHA-256: 3be7783d7678258e97430bdf0634c59bba8dc302aa9919980f6fc8dd720c7121
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to host and distribute malicious content. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b1870fcee---dojavajupamerofi.pdf In PDF document text
    • http://stlnsk.ru/uploads/file/levoz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608853a325d89---xawezutubabi.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/moviruwizixitemetexonaf.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xumedelipep.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cc76e64b3---mazelelurapanomunurakuwo.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nl72etju4tbl20lb92p9b190q6/76725270201.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/mizekijezudet.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/24b67e868e44574840169390762bfc51/25793950532.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/69827144478.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2024357af161aa6377894d27a3c9ea4f/dojobi.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/72hfut3as3g602ep42fd25pva9/24864943519.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/uefltlnbahuq2dkctqkodbkumu/navobuzofo.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608888697a16b---juzewaruzuxeranolapipuvur.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/fa2cc870419355c17e8f0623c9a8c35a/14446726836.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/55040225116.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/96448066040.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/54242367620.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d68febb42---88643953559.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/luzawafazifax.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fb02d71625cdb98cb43031036a422b6d/76952834655.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9ff47255a8b50db472b9f8a4d97e2266/lowejav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=conditions+and+warranties+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/48063405949.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_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 17604 bytes
SHA-256: 5868e75663c19d450917acac7dee8aff0cc4a074b2754f8b2def4e9864b419ec
font_02_sfnt_off000153c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C7 10560 bytes
SHA-256: f48704e1c19d951b50c130d83b3afbe35714158cb2999caa69cef9a78206f3ec