Malicious PDF — malware analysis report

Static analysis result for SHA-256 600ad2f0e6d21834…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 02:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ef4c7ba3e917c0c5cb7291222068052 SHA-1: 3ca02ae196555c026abbf9f3dd33d2a9bfef621f SHA-256: 600ad2f0e6d2183448cd55bdb76c99bb47370e6fb0877bf3f38aaf8f06587ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to numerous external URLs hosted on compromised WordPress sites and disposable domains. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=a+type+of+antelope PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ef69d360---sojax.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/zininawaxemitupos.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/noribudapimi.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/sobobipuf.pdfIn PDF document text
    • https://arerp.kr/data/file///9834357657.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/72272239601.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2e5e534ee3d25f003c95de139b0904e3/rujikokade.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/wowopibikimexamejudujopab.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/43587369970.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/sabevetavo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69a043986e---71062218900.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d84c9d3c7fb---dalaximotogokevul.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c3fe1d4b8f332ea41bde2be61bb07384/78919632448.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210822112438.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a702291cfb4---femifukisivun.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/melopixadugidi.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/45445613527.pdfIn PDF document text
    • https://hse.tw/upload/file/17593870349.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/73854977005.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/bajalekotebilisajalilara.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fc462f89dd6---83866303388.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/gazibokaviluxexawed.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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 10088 bytes
SHA-256: 1608a6d9c32197d94fd50e00a618ae91ec826b4a40e666e4063c68c0918c7138
font_02_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 16504 bytes
SHA-256: e6779800dd9bdd8b230997a3ceb603f8ba17932ab597a0158c4d8bb6e25d39ec

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