Malicious PDF — malware analysis report

Static analysis result for SHA-256 db04b797677dc058…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 07:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ab555d0784deb6bf5b0ce11133c7268 SHA-1: 8159c94def6264f6377291cca8ffe84d9bb37413 SHA-256: db04b797677dc0585765b1184b3be16f04f5d7eb2f55beb6db11ec3bb41296ae
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites. The presence of embedded JavaScript (T1059.007) further supports the execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=day+planner+ios PDF link annotation
    • http://jorkurojus.com/userfiles/file/xebibuf.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/lebipiremefu.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zelupid.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/sufibevof.pdfIn PDF document text
    • https://bdata.vn/upload/files/bagurexoduxatadum.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4d967a86bdd58f5a514b96f02c3bfb7b/buxaxagil.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/14774114662.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/37944683165.pdfIn PDF document text
    • http://schokozentrale.de/idata/98574009054.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/nosan.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/20071632191.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/6808966838.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/jamiteru.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/61770829158.pdfIn PDF document text
    • http://dr-temt.ru/images/file/pubidure.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090602540623574.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339730adca2---luzebepalotunogi.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/jofub.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ba682aa84f4314066ae9ff04cc750936/fawetogu.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/93899580069.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/mabuxomewadamif.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/vagotedavogopali.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/ruziteneze.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xonenupo.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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 18532 bytes
SHA-256: 110dbbed284ca9aec3ff9a15db0c799af32778d2d34725dfe7439537f0576bf9
font_01_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 10260 bytes
SHA-256: e35a2ac538026da55dba0a6ea0885627158e31ef4730a667b3fb4c6e979b7984
font_02_sfnt_off00013106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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