Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32b4d4d4bbb7335…

MALICIOUS

PDF

93.3 KB Created: 2021-07-01 11:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d9e254d8fad7ff1f0e506d2bdfec177 SHA-1: 5aa71230557d3cec7094e2c03fe91d7825f505ac SHA-256: a32b4d4d4bbb73355fab45bd271388b2a47636ef9be4038eecae385ce41b4e6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs and link farms strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://evohome.pl/userfiles/file/borirugogujupopepidopab.pdf In PDF document text
    • https://jdlpartnerss.com/userfiles/file/namoferulak.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/db29307ffaa91d0b6d45f645848542b3/nijewav.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/xaxapolutaxi.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d4b63998cb14de061873480257020b91/15915175394.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/35703431842.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/47125318502.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/kebojosadivuxek.pdfIn PDF document text
    • https://datawire.gr/files/files/9447882877.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95d2b0c23---vaputurof.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857e8e8f08e---8095715223.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tumufusutabub.pdfIn PDF document text
    • https://isleo.com/i_photos/file/35434011879.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa0b0e10615ddcaa23474be5800836b4/butoruwevipewuve.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fed6abd05---jodelezejivip.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/gogugibonojawofimova.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d511f1e54d---33890874462.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/417191217.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/14285920677.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c634d45b66---lulavizufol.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5f0c15216---53104162204.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc4772efa---jijivoxopuvaneviwozulawu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9b46a780---38363856468.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/04ac8ddd0b4b9b30fad5898bf1017ccb/xumuwujove.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/96e6f9035e25552428f26ccd4394e251/lepoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mission+impossible+6+onlinePDF 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_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10352 bytes
SHA-256: 673db7c457e422ad1d30ab671b24efc61e02736838c768f2201edf608a00a353
font_01_sfnt_off000113a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 24864 bytes
SHA-256: 8018608b62b86dcf2bfb2ca6ca8fe84d6d7bbfee3a1eff4a67b566ef311d0d51
font_02_sfnt_off000150fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1