Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cabab6bf2adc97f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 23:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12c7da7ce3308ed5447876fc47d929f2 SHA-1: e56009b149a01d66162c4c069e21b4e885e8c5c8 SHA-256: 1cabab6bf2adc97fc804b9a09eebff720069e99acca964214194eb0bab265e56
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, exhibiting characteristics of a remote-support tool lure. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to trick users into downloading and installing potentially malicious software under the guise of legitimate remote assistance. The numerous external links, many pointing to compromised CMS upload storage, indicate a broad phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://huntic.ru/uplcv?utm_term=color+by+number+subtraction+worksheets+1st+grade PDF link annotation
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16126c1a50c8a4---56380759350.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/53538241438.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/81959548094.pdfIn PDF document text
    • http://teplospectr.ru/images/files/joregovopanud.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/31305102970.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f98fc429e---73183615358.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/49872915848.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8ff63c17a5442a64ac57c3bb580d5b2/42227460367.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a1224699ad6ac227069f928415fa56d8/10538276313.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vuvosijikubotepivujozu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/desujil.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f1dc46e16945fc81b37b160ee252d851/44110446135.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b775ac4f8---sujefifexedanewetugerigaj.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6fabbb4c---62760139736.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/gumolasan.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/0b14577c69ea5d74ee6af5f76c42a4a0/69245538986.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/wojowivob.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/11324581015.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/44cc0d9f54263a64faad8792813c40a8/42684553409.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6038f10a---78076724296.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/09o0b974jcbsamigncius645sr/66054935050.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/rirodadejoxoxol.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7ee23878---sagawisugarariduwoge.pdfIn PDF document text
    • 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_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16596 bytes
SHA-256: 7d9c1866db03dba7b2c6524e997fd90d8ee0a35c52b640398ec0a753a7845683
font_02_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 11432 bytes
SHA-256: 4f775a2430d75ad96586031af85b2121c2473a9e05b98bce01089c6ae14d5f49

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