Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ecf30f56d9744b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 04:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38d48ed3ccd85c0d708b67470be153f0 SHA-1: 607114f910875c2ea689619393563ff0278868f5 SHA-256: 87ecf30f56d9744be44ba5fef1dabc744605fb4a0c56907032d3878bf2ad0478
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to URLs hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b9158be4cba35887aa5e6a60a6e693f/68854882578.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/lapudal.pdfIn PDF document text
    • http://kaies.net/upfiles/210908074205056619m3xirx.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/61608201227.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906110729.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/xibuwoputis.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/lurefimixodo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613535e7b1301---67767134383.pdfIn PDF document text
    • http://stonebreaker.at/67066829386.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4a24e77b6a1c69304ead8ca4463dd570/tofuzet.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/bezixofijexovawe.pdfIn PDF document text
    • http://grimastone.ru/files/vetaxa.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/66715276345.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/nabiwulabijivizedonut.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/kolokofurazogiwapadozefe.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/68420481090.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/femasa.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezurevog.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/pigedurufelidilarozu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16704013---66775933965.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ba9deb811e5794c9f11e10172796c2d2/86984794117.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/zidipuwerenodiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+ir+blaster+app+for+androidPDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 17776 bytes
SHA-256: bdb2a524b697c1c3ea61e2bd85b6acc8498be3d8e9cf41d9338393940300a2af
font_01_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 10684 bytes
SHA-256: aa74120bd683e3b2de0a30af11b43b8315356d1de5ac634e7da19b4648921e8f