Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd010cfd800dbce1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 10:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ebb69d0ca05e6dae827ff8196853061 SHA-1: 685b7e6137609596cfe698f820cb9aae5c5b8a90 SHA-256: bd010cfd800dbce160054986740a5c151a0e615153b59b738f462bd7d3141669
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://iehyun.com/editorupload/file/52002151688.pdf In PDF document text
    • http://belovosushi.ru/files/guzujemodemejujab.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/912574bc0f7659ab1f81c615f2607601/35479766881.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/15990315028.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/beronopaf.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/a693792d27b1fc203fdcbbc8ab7875e2/dovopudugomogoluvof.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/56fef60a697ca44856adba0dd540ce8e/54633701055.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/1ceqcrjlo30i6at0mpr8jvcrt3/47138137169.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/4ca874b24bfd33e340a1a26115dd1924/sapagoxixupe.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/nufesenuzarapat.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/xuwemokilipemiraw.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/85863308904.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/82556456829.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160866990ce302---wenufitakusesuworoj.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8aef2cf3---76784428157.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/lepoxivugumigulifive.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/ludalawilusa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20c8cce5---zadanagenarabanu.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/57875090414.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/14395910125.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/561584b1f09895f386175a8e8261e022/1718773103.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/debetomidirusugorusiwam.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/5961405345.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/247b6a78b7faf0dbf5708ebf96e4bc0f/nafijegajezogefulapol.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/gerimololanusedisudoxus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=a+urbaniza%C3%A7%C3%A3o+brasileira+milton+santos+pdf+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 17852 bytes
SHA-256: 18086e2465c0d11f9727cbf04afafe53ece90629b9cd9221a60dcd694b91d22e
font_01_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 11492 bytes
SHA-256: b6aeb71cefce5b578c439bfef34c19f529b403fe33863e2d23168f353dd2e76a
font_02_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1