Malicious PDF — malware analysis report

Static analysis result for SHA-256 371616d2d8023681…

MALICIOUS

PDF

93.8 KB Created: 2021-08-02 02:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88a122ce082d23971e4438f3cf58d3bf SHA-1: 1c421086a60c0179bcb24dff8ef4d7c6c954dbaa SHA-256: 371616d2d802368142cb005d2b3d78406de481b4b0c4492d9ee7367f11cca9e4
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to external files, suggesting it's designed to lure users into downloading further malicious content. The presence of multiple compromised CMS upload links and disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mgocsm.in/userfiles/file/97766901805.pdf In PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/94068916677.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/xifozidejuroko.pdfIn PDF document text
    • http://strandedtattoo.net/file/12326434163.pdfIn PDF document text
    • https://ebooksweb.net/files/file/xarezulen.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/gafolotonotazobogurafimo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/61337954736.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610666f84aaa1---45189491651.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/mowabepibedif.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/xuzevekuzizidi.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/polalesugesezazipezuj.pdfIn PDF document text
    • https://33mobility.net/uploads/files/9382583911.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e051dbb02e---61723758552.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/dab55b3aa7f73db6ee823e3959cc7de8/duxugunomova.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/34267476505.pdfIn PDF document text
    • https://phr4u.com/files/37664210040.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f47c86ee559---37765446261.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tisusowowa.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/10241116975.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210717_96AAFF03222641AB.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adc2c4774a---31835716191.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7240d7c29b11580e9928bf7bf7019468/bizaxezubepuxotifenojile.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6a6d2636d64ff52cc5a2a5899017d063/wulew.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wurawoditodijabuniju.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/tanofonemivedefomozej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rally+fury+a%C5%9F%C4%B1r%C4%B1+ralli+araba+yar%C4%B1%C5%9F%C4%B1+apk+day%C4%B1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 10648 bytes
SHA-256: 9b30b768671025324bfe78f1697cb4e56eb6fbb1f11d823ae4846e01a049898d
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 19320 bytes
SHA-256: 17d8835ccdec899fd17fe8665e8795f5f4efd170178a68fe6a62ed87958be135
font_03_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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