Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e180f520d58774…

MALICIOUS

PDF

71.2 KB Created: 2021-07-03 07:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 526ba1adf36c25224c91b72efd795825 SHA-1: be909d2f6cde2d3e5fba966a8813813f3b914276 SHA-256: 28e180f520d5877411b424885788cf7da9759ce4e95dcf5b20b35e63e6a790b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations and disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers flagged this PDF as malicious, with specific detection as 'Pdf.Phishing.Trojan'. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/e654522f7ecd28c90db48c84064443a7/fofedivawinewizixe.pdf In PDF document text
    • https://astek-telem.fr/userfiles/file/81530827447.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fbe8076829b85bf40623f505791e0c4c/ganakulofeduputixi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae8697771---58487777568.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/17940828442.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1624999998.pdfIn PDF document text
    • http://simonide.org/userfiles/file/dolumagupusupeguvavewe.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5494790403658eea1cb1dc1e87f8f208/57815101733.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/buvc86vtfea4h35v7sshoolg3a/94067346283.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5894bfaff157e072bfff56e104bd8470/vatotofiwitix.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da7e4983e---nerafobovufuvujim.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/f49ff19ed158adb414de08ac9c584f21/85424022008.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfb97af9f---vodexelapunevanafuviw.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/20357724982.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/39155985373.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0bad3f12ea645c3891ce886c5ff4650a/bawagibasu.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/sejiketuf.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8eeb59d19c9c383a6aa4df36d25c0609/xekaves.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dmf8enhrt087cpum4tpoj9tp17/bididurevaxumudod.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0e81d44f---91043448060.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b8cec3d6a2c320a0b3a43b3b34633175/tavabamobesawo.pdfIn PDF document text
    • http://martonelektro.hu/files/file/limezurufegiz.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5ffc7345522c6b47b2a7e4af62041ccc/86531893813.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/aue5gi9nr2pm6m0osgtrqf7ke5/40172583329.pdfIn PDF document text
    • http://naviway.su/upload/files/96447716080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=typedef+struct+cppPDF 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_off0000ba41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA41 10264 bytes
SHA-256: 3155e5bacee70a8ebc03aced5f70883af47dcf98e95ba6bb120429e8dd45640b
font_01_sfnt_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 15064 bytes
SHA-256: 4d154eb5a5ef36eca40bcd97fd4c12b6505b4cdc5a6ee31e7e54ef96a79a3fa7
font_02_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1