Malicious PDF — malware analysis report

Static analysis result for SHA-256 d866dc062c33c86f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 13:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7609066c48e60e6255c88653fe178810 SHA-1: c7ab300a90f64a69503b4b05cc8a6e467344fa5d SHA-256: d866dc062c33c86f3d2df4a60b92a0636092b1bc7759bbbb7b5a96cb5cb966a1
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 0.9981

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 http://dinskayarealty.ru/media/file/13440020966.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/rubexotifozirijunawatexa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/evvjh112hu2sdpmqdpqajghl40/nozigolavanujiraf.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/42098649786.pdfIn PDF document text
    • https://ikima.fr/uploads/file/loxogigibobumupupisiwoj.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931c7b7f614---levinudolegufijelufid.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99824186811.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/736467c3cdb44cbaa4eeb45dac428265/21510827512.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/84285945006.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/rumafava.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/601huej2os6ur6pr46604fi0vc/gufepamozeginatuwu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/fezutivasitelajapaxanegi.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/30689307377.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08505ddd3---notuwesanomikedunap.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/717cd352696da968708fc74192162a0b/kiwafekatopel.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pexorupikawoninalurirum.pdfIn PDF document text
    • https://olterus.org/contents/files/9903705802.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/94db11562c1c84cbf7395e3ad4aea3f9/19813535082.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/75830829841.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611feea9f20f2---10127103448.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9352dda0---36348132084.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/be3df4b734549adc403d66faf74c34a9/topafebinite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=my+grammar+lab+advanced+c1%2Fc2+key+pdfPDF 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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 11096 bytes
SHA-256: 57f7a1eae0e6b02f659465daa72dd08b4b28622615ba8976e1efff5eb96b35fa
font_01_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 19512 bytes
SHA-256: 01277796f32b9c2465014cd2d4459e6baf5cfc280203b7a640ffcb1ee6322261
font_02_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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