Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a252a6ae1120813…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 10:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84fc3261fbe8271ac29e6e03da8b5b94 SHA-1: 6b83bd0c7ef5f1c273718cdf2928dc0d5d8e6d53 SHA-256: 2a252a6ae112081337a3de84b32d2fe0bc887fe67fea6f9a5b641b8135cffe3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm pointing to multiple distinct hosts, including compromised CMS uploads, strongly suggests an attempt to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://vandolderskb.com/images/usr/50076034315.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf54eb0900---65518504366.pdf
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/kelusitatugej.pdf
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/38359741905.pdf
    • http://bobiniauto.com/userfiles/file/58186431782.pdf
    • https://protrialse.eu/files/files/20387710001.pdf
    • http://ratchee.com/ckfinder/userfiles/files/71881124886.pdf
    • http://akcjonariusz.com/UserFiles/file/zovupefexobiponidola.pdf
    • http://lycee-elm.org/userfiles/file/vexolomebiruzigipi.pdf
    • https://rusepress.com/uploads/wysiwyg/files/bibok.pdf
    • https://insolite.lu/img/userfiles/files/devakemamolarawotad.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ue6o42cnurtqp3uel4q463e2h8/4665840821.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6bf0925ebee710e63f4a00b7e647fd41/lebazamapikebunilizifufo.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6rnhio73qa0n8vptvgdlfcscir/bodewubi.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/wepivinoxufatugazef.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab001e4036---94589705821.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=honda+accord+manual+transmission+for+sale+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22a.bin
ac8140340060da500bdcf15d14762ed6e0ac96447110cf713fa210b7a2df0cb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 17876 bytes
font_01_sfnt_off0000ff6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 16792 bytes
font_02_sfnt_off00011784.bin
14439817700465f9f62f824bd62a331824b9e93f17a012769b138adf5484c18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 10728 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.