Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8df1888da672ab…

MALICIOUS

PDF

76.1 KB Created: 2021-08-27 18:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b31fb2975e083fce04afea434ce1ff4f SHA-1: c51fa4954c4403309792eb5ce7e53bc3cc975a4c SHA-256: de8df1888da672ab77ede8823fe12151d0809c60fac9ee011963f0e31029c8e0
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The document contains urgency language, suggesting a lure to click on the embedded links. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xn----7sbev0bhje.xn--p1ai/images/news/file/34418530421.pdf In PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/2dcd0d624f8d1fd622f90ab1236a4e51/26029965080.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/57648636027.pdfIn PDF document text
    • http://usagimatur.com/files/others/9677462200.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c50be970---fosekelojarovisosode.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/31223261130.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/1accc63b45dac8da960fdc1be2ae316b/pitetunetusus.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be41a56442a---runedevudopabupexomowi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kcnk2iap3491r90i859iqph3m6/bikuwitamoxujarexo.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/5967871449.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/xasebozipawolode.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c8fca0d392---57328409628.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/sewemejasegukesodapaj.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094713094dd2---25799916989.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/77415247009.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f358975eab---nejufilakadakesixaro.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4dba924ce2797ec3c62dcaba1de53cda/tiwuvasokewatibirazeso.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c04c804abf5b9fbd3cfbcd70d568e7b3/jefudesosironaxaridexo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bf50f199ef0c043390e59a5bf6f92924/27753367007.pdfIn PDF document text
    • http://asustainable.com/global/file/rovixeboxajipesosibimad.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/f7mai2869e4mspb0rborfbrcni/winadozikerudexenonaze.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9c2b280a3---11931609239.pdfIn PDF document text
    • http://kyea.org/imageuploads/48501928096.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/78144130231.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5b69b2c9ea909657d56bafeb4c1e6bf3/64458601313.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/15863684826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pobre+ana+questions+and+answersPDF 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_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 16700 bytes
SHA-256: b3e442fcc5148ee9bb8e96b78e2721035812729d052be1cfe6e319e192c6ba1d
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10668 bytes
SHA-256: 150a2c22080244917491b3a59b1b87e562c0e5b9a54d9fb44ac09159d2efd2e9
font_02_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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