Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae30c8decbd0493d…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 09:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b2ceca601f5b73aebe3132d085d013e SHA-1: adcfb5931fc7d61aa9b21d9f265b6ebf74397e74 SHA-256: ae30c8decbd0493d332469f5dd3948ecb81f5ef70eb94eb2309c4d59173c29c2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of multiple external URIs and link farm characteristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pearproperties.in/userfiles/file/73778051102.pdf In PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d69319d13---34682956533.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pp2m7khibeahi0856kdua5fuea/rajubemavamitig.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/duxaxolapumevowamitijajol.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2b35d4ee---sarepir.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105162001113929400wbfz3.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6b6e425576523e3c6501c7e1c1b52ad3/gimimirukurixopatopo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e32952bb1---fimugimorujugoremokika.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/95d16cbaa09284573c105d4279c108f2/98676645483.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1ba882d59df1b55e7b251b36d51a3c57/pipul.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/lefegovuvebo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xatuvunevoxi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea01109a26---jujikijumelaxolosunu.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/karibawunixalid.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/sutagoju.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cfl3v2mv4nb0gupnlajvhfao69/17024951744.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/tuvezeketagit.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/58a333221f3171de534153793a97a518/51669668346.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/50aeacf5a55b4efe6fb4ac89a75fd75b/552277503.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210828_036860FED835800B.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/wejivodagarafe.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/votakat.pdfIn PDF document text
    • https://badoza.net/userfiles/file/75780884023.pdfIn PDF document text
    • http://hkalc.com/userfiles/kamajol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=makalah+student+centered+learning+pdfPDF 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_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 17572 bytes
SHA-256: 6c32526d327883b71ee03b38b170bf29d6f54cdcbca46cd5878baea28f664041
font_01_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 10964 bytes
SHA-256: 7781f90db432c390faf285f7c35108456fea332117813acbbc2eb6d2dcdd0a69
font_02_sfnt_off000136e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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