Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f84c21cd3af59c0…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 05:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f3df6cd4dd44b00825f565fe769974ef SHA-1: 8dbdfe3c4e617b23607da0bbc4cce9bc819e0458 SHA-256: 5f84c21cd3af59c04c7c766c7b152a605d04f9692faaa0c5236920451668a285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ece39821d57ee8ae38a089a2fa5b0bf5/2618937545.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9de7525b---92014645888.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d92651d989---lepimegebogen.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d611a295---dujajusiwumoja.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f20824c0db01cb5513a7028d821fe1b5/xafazadufugebixakibi.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/tegerusetexavadisefuziw.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a6791aaecf252e94cc1798353d0f5ae8/69399639144.pdfIn PDF document text
    • https://jambukuning.com/contents//files/rebop.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/xiwuxogojomutoterigoxug.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c455778d164649936ab7f6029b4ea608/53288522492.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b899138ad10---zipaxobaxe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h278d7r0dv9djbhd56uufjbaps/38651601499.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34fff1485---mevubenatizekizofig.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/68078671446.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/rerovifaxadapiju.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/36967652743.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd89432c6f---jumexilidobosososak.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/damesusafujipi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8fa2e4dd6---75600981206.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/94624856125.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/30361359569.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/vazokorokete.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/48674777909.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/nelalubanegijiruge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+install+honey+selectPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 2140 bytes
SHA-256: 0735645ad909c4aeafdc86f580bc7e15173cc22a0ca708b4a9c4304e446284f3
font_01_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 20376 bytes
SHA-256: 547854ceec9839e49f4517e2b2078e9aa414b7a4ce9961140c5044dd21315c92
font_03_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 10416 bytes
SHA-256: 4cb1940e65906e1dba55c2f3369f78cd502a8b3b3359648756a0bfd5a3a04265

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