Malicious PDF — malware analysis report

Static analysis result for SHA-256 368d4289e039c873…

MALICIOUS

PDF

94.6 KB Created: 2021-09-17 11:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0c53dc3884780584316983f6aeb9a2dd SHA-1: 0451cace4c6efa8137cebd662f8e93bcb11de35e SHA-256: 368d4289e039c873218b80e41b9cd6bb8b663fe02c00f70ccaf6577df22c92f8
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=what+does+reset+app+preferences+mean PDF link annotation
    • https://ermolino.mebel18.com/uploads/files/65582012041.pdfIn PDF document text
    • http://chromavials.com/d/files/jekofabajagabeliwowobogu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/gilerekatatowagumeje.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/kukon.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/1206153867.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/razugejodojowisazunud.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/vetasatulilugosebitaxego.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130664a89dc3---51783599028.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39109215667.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/20767388304.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/sevirebalupozimiwila.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/tozidiburesawufi.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/88311487288.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/mawiranimizazajetalavijan.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/86168795941.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tifikajaborelagusar.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/diposapulufake.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/17647595297.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19d197806---rufekabugisexujivazik.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/wugoxew.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zemevuxivele.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/fezotov.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/95838425549.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/980846080.pdfIn PDF document text
    • 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_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 10740 bytes
SHA-256: 06731895c37f7e86baa7b6d52b8798e0e660ea14b1d3a04e07e04b9d345160e2
font_01_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 18512 bytes
SHA-256: da8daa63974743495e9e6795bcbb1ca755cf37749aed45a8c310837cb0b9d16a
font_02_sfnt_off0001540c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1540C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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