Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cbc137f54b75a2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 06:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7848e8201ba32158d3d2deefec043b55 SHA-1: da56dfa25fe35ab014d3a8f1fa9905fdef5436e5 SHA-256: f4cbc137f54b75a21987dac0e6d5145131e8b5400e28483794258205a9a02c7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it's designed to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=non+verbal+communication+presentation+pdf PDF link annotation
    • http://yongqingtech.com/d/files/zajomatemovidafisito.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bca042d9a---72541943539.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d7336668---33138484343.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/dipuv.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/13504871032.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078a725bc9bb---31598715098.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/40524212750.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/17020267354.pdfIn PDF document text
    • http://teknis.it/userfiles/files/supabulerigipubimamejolo.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vakiretiruriwepuwagokado.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8502c918b3---sozodixowabewetusazu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e97e121b03---64491119620.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/77748758898.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/kagilusokuwusodudu.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/bejinalumaze.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f1cebe26bd7d60a17888f8e2f67b4a75/fozurike.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa4384eca5---mikisapolarofuzaxademiwit.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac88977abf9---75186987379.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/91096252129.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160753e072303c---pexinurupizivufokikadeb.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16099703867ca3---79147306669.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/93ff9f683a9cd79c65f68738eaff629b/lavezariso.pdfIn PDF document text
    • https://emprenderem.cl/files/gopati.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/juwalenavirutexejejejako.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/20266261366.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_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 16748 bytes
SHA-256: 10bf28db2e311d0e51f13098b59040e263a40dd811cd3526e48624bcbe6eef11
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 11064 bytes
SHA-256: b817dea724ef04c0651c0b19a359b209dffcf0445519131f63300efce74041bc
font_02_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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