Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e236a5f8ae67a3…

MALICIOUS

PDF

78.2 KB Created: 2021-07-04 17:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 87402ec1cca5a3ab3d8cdc99add2a460 SHA-1: e5caaabcc422ca4d192e7b637b0d328eef081f7c SHA-256: 90e236a5f8ae67a367404c48bf933625de7031008c701b548fb94f2ed189a85c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or engage in SEO abuse. The presence of multiple external URIs and a link farm structure indicates a likely attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b8295878e7b---sezefubikumetonexagare.pdf In PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/51344846556.pdfIn PDF document text
    • http://skupka23.ru/upload/m/buwolegefupafoful.pdfIn PDF document text
    • http://mp-journal.com/media/file/53900899608.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xepizewuromufevilavof.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f30bbf1c4---watepetegotexitusu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/vejuvaduvafufujoxafufugit.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/28813112639.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e3b44e334316acbee78857146178d031/66533996347.pdfIn PDF document text
    • https://digireg.li/upload/30517403310.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608343804adaf---58363724757.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/1328188606.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd8b59c98---75407297031.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/revaxugupor.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417db1c8f8---wabikozixikovoranuso.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d851cfb8a---wisofux.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/zeluvamuzidig.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d8fd83ee05fa02c44dae0a9e63b14340/wogegarisidelubobaxaja.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/20366519436.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160796084b741e---24172048886.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8f18d7dd---28110763487.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ceb9e1bc6cb0a6201eaab3d3bb69e498/10428911110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=byob+song+meaningPDF 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_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 17156 bytes
SHA-256: ead7c2e67170e7466a359854b33fd4431c097830b7c3f3fc496f01075f2b4a75
font_02_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 10512 bytes
SHA-256: dfb65cb8520ef27679869eff7770a19d41e5c6f36f7c10c8ad14d98cbe7b687b

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