Malicious PDF — malware analysis report

Static analysis result for SHA-256 164cc7e5962f8bb4…

MALICIOUS

PDF

83.8 KB Created: 2021-07-17 14:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c80f385ac3a7b03f6ee9c1f008a1b363 SHA-1: 9152db6a48690306322aa40e23ebd0ee1be1bb74 SHA-256: 164cc7e5962f8bb45374b8cfb8ae56a49406aed6baf3e77aad2be38edf5079ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jbdclothiers.net/emailer/userfiles/file/ripigujewefutaroro.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6389017608ee0928d297cc5ec3d1ab48/74372536085.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7a44676c85480ac312e14d0e4c82504b/nekuvoxebixepe.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e047132c---zopimijixikawavifisufanuv.pdfIn PDF document text
    • https://tomas-music.com/contents//files/60583528907.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/77463013203.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68156c5678---72776885040.pdfIn PDF document text
    • https://aashianarealty.com/file/kufujagakolomulenusu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9e1c282b---nufofawobobajuruvinivep.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c7d1ac5cf---kujilemiwizuxuxitotosuled.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/152854b90be7e902045832a61ed04687/mubibujeve.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba7414556---51599628741.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/wekedume.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2c75e0b6---rosewigafunutobopoti.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/8905280259.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dc93114f9cc6ea980695c263e2bcfa70/52066202269.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1470507412fce7a0c677d49d4341980/golivexas.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/5994a0b9f87b7704eb0fdc8c6ddddc9e/guxepanurutakupilakud.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/xogakisagasawapitota.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/28200794729.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a99016344---70557916180.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/60765036956.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/53442374030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=types+of+business+organization+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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 16272 bytes
SHA-256: 5ea9575a93d59cdeacf55f3d05bcbd9d27cd43018015434c572a87849ea872a6
font_01_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 11004 bytes
SHA-256: f901599c1f39f67334b63912e7828084ea896e0541cc450d5c6127cd3b468bf8
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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