Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b0b98e29ed810e…

MALICIOUS

PDF

99.6 KB Created: 2021-07-25 20:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f97a8518187f7ca9875a48a30909c903 SHA-1: 1134a1f45a24dcbd8419d24a8dd8a9a6b252583a SHA-256: 73b0b98e29ed810eef43864101df3a654b1d895caa635099d2f7df9b87867b33
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to compromised WordPress sites and an IP address, suggesting a phishing or credential harvesting attempt. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to malicious content, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://m-isc.com/userfiles/file/80121992566.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j511aor7l8vjkcjgpgsu69q542/kejewimatewikisemutepef.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/af04a68a4883310d642926e124cdc1bc/xazaxuvanud.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/75436998726.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0a3925c24d3c6afdd5ede539ec10eff7/14639774062.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5fce1d0546dfcdf2d8d165e0a9315fc6/71299676196.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/vk2del07hmaoj6igek7vugd6of/97638609670.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e75ce2ba1---64983304678.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/sulolinu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/394b42b8f2c72f09b8865006cb9fd9fa/nedopalefabokoparako.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/18f513a12425a51d4e85ce398e037f5f/68315517986.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rozetawema.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cacc464280e921e5be068710ba9c6498/89244530196.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/wiramav.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd248a79e---famulagobolejemozumavawew.pdfPDF link annotation
    • http://bluekeydigital.com/images/pic/file/18522745375.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79866007fb0307b0fc85dbb8be8f91fc/92169114834.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/g5t0jbs7s60rd8hmao56a7aaf6/63521528136.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zuwuxajijedosab.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a60rt3knsns9shjmn1nt84q4i/menudokobiriw.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/jopelefizonojiware.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1c84392bde2e87843e634b1d71eec0e0/rofosatinepilagexax.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248b53db73---31147790897.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/dewip.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/32230714566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=maze+runner+3+book+vs+moviePDF 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_off00011e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 10748 bytes
SHA-256: 39e9fa55b73793b541deb328aa30b7b8003bafd5db95a9b438423818ce74eb8c
font_01_sfnt_off00013730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 18100 bytes
SHA-256: 3ce91fd89bd5fcaaf1e1470cc385641b9c7c96ccd75200640720e0e45e88ae74
font_02_sfnt_off0001673c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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