Malicious PDF — malware analysis report

Static analysis result for SHA-256 137470af4682d709…

MALICIOUS

PDF

74.7 KB Created: 2021-08-17 17:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f911e1c7b59d424b00867bf464030f1 SHA-1: dd44d5c06d587e4e3ddb42454e6cda5170fb85f1 SHA-256: 137470af4682d709c3b1a219741c9fbaa8ba9765a2faab4e88bf41f0c9edc588
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a link farm structure suggests it is designed to redirect users to potentially compromised or malicious websites. The document body was unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://4grd.com/cmsimages/file/jonepezanevisureki.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e2cfe4403b10da09b6e1cfaff287b45d/zurolevabixotasosozer.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/93858866459.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/11224675455.pdfIn PDF document text
    • http://vswet.ru/f/lulek.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090670782415---kadaneb.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8vk8nt31lshkb0mg8u3tn080j5/raxomawogovusixovalujus.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kji45oac5cbm7h6ntgugdhrrd7/bopozateb.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/47776187683.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/42678316277.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/15620953088.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/11378166331.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9757a7205a---86432693483.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/zemukuximomenulatix.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/jozaxubevixotososobazo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b61efb4a---60583862672.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/10fqf20cff9uhbn6crohd0p3r0/11096123213.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36bf87b0a---sexufuve.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o8jtekuj3oihp2536nggokc6u4/tuwimilumufebisudadob.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/k9551plhq9hr4s5bjv4sac4pu1/81656212594.pdfIn PDF document text
    • https://dm288.com/slicice/file/40456498472.pdfIn PDF document text
    • http://partnercable.hu/files/jikubonelopovilapadeso.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/7966054352.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608164196ac2b---25685681998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=comparative+and+superlative+adjectives+exercises+5th+gradePDF 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_off0000c067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC067 15932 bytes
SHA-256: f9f533b0f8246ae8ffdb75e410c6921742f52b0fd63e655aed53f3d7debcdad2
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 11524 bytes
SHA-256: 73aa2e37cfb24ffc12caf1ca28123a0832a03e643c505a76635b952672c6b969

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