Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b6c9a95302cc62…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 04:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41f9df897039d8788a4029ccb7a81d38 SHA-1: 2dc3d2335261e98605a3a50605a084df8b21a745 SHA-256: a0b6c9a95302cc624d2dfbc087e187131eb0cd0a929199761d5976aafd94059b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content or phishing pages. The presence of numerous unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cjevoimab8nrliohkqbtautqs5/68223030801.pdf In PDF document text
    • http://mbcasc.net/imgs/file/99054135587.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611161bdde36f---firejojulodedezej.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/aa9363a6c333ef10e688a580c572f409/lawezefison.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d275113b96f1255aef61c94757407f35/woxevudawulomodifisa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5c80cb6c3---71597922930.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/66515656903.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d7c5d256---bugepilejedigefomow.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/63000722195.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078bce9f1645---nipavawekizejofatesazer.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/pexulojuxubumetifedemevez.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/49113067367.pdfIn PDF document text
    • http://poiskvod.ru/images/file/96456776329.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qdcfl3f04h7590i6g8jopllu7u/68018318127.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/dizor.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/panabapidoperimogosa.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/80462249212.pdfIn PDF document text
    • https://studiorampinelli.com/file/27789600400.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/zunetezerop.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083da3918b45---83193229513.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/sejodopo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f041f96fdf---53793629546.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/409a48f7d86b02b3f9a4e5376662fab9/22157103040.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/galorasepe.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dddacac9---28360014955.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jepapigig.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/21344105392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=burger+king+coupons+pdf+novemberPDF 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 11108 bytes
SHA-256: 5d72dc6a2df4f26e4fb2ca68ed3915c52f9f872253bce15a05bb47cda677d553
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 18124 bytes
SHA-256: d2b3df9aaf066eb2475aa82bd28a94b3489e571ff891c61d511a02b6c7283289

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