Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ff698cd79cc698…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 05:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d2a9e33d520b99c8ec9826dd37771e9 SHA-1: 3898fb8b951192e66976fe554080d7be001ab654 SHA-256: 84ff698cd79cc698c5111461e252621cea14634ea19690b2cff5b47db14d6d68
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external resources, some of which are hosted on compromised WordPress sites. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. The ML classifier and ClamAV detection further indicate malicious intent, likely involving exploitation and the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://nesemlak.com/test/images/uploads/files/jujofu.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fokakafa.pdfIn PDF document text
    • http://hejia-ele.net/upload/pozuwazurikuv.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/53340950521.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/31282300999.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/nubesudesar.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/63134941143.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/juzegumowetomuwupudirokaf.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zedanugeletubobekugapowav.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/daletojegololenidab.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d6cd63722ae85abbd28bc7a584d64a0/42705189170.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/rexebomaveradigelo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sefukexaxanajulegademi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161317659a7222---56035060507.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/82771821770.pdfIn PDF document text
    • https://value.ae/userfiles/file/305824925.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/porazitosa.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zizavipibewogomedexeke.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/fofivunedejosu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4b19972bdcf8770f59b9c8ac0eb7220f/bazekorofu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86e4172ab---38377908825.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149ced1e18bf---rupus.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/73589478899.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/tenusupunusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=train+simulator+2014+steam+editionPDF 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_off0000b12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12B 10844 bytes
SHA-256: 784e65ced24c765f7088fc9fedb7a49d6df7395ad99cb65d7bc92c82a4c033cc
font_01_sfnt_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 14560 bytes
SHA-256: 88f972d038acf62e6759aefad20d203020ad4081634cd908082db608886a471d

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