Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1c870b83a0153a…

MALICIOUS

PDF

111.1 KB Created: 2021-09-08 08:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f22d8f7b9121ff0e962397471d1b186e SHA-1: 185cde03625672ea59535a580b37417ce154d46f SHA-256: ef1c870b83a0153ad9ca4b956999a3bc15b961b1edd5230cdad12ccf21057a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://dkmmotor.com/files/userfiles/file/27364101188.pdf In PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/peponewavamiboponolovote.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/rulefi.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/sanewaxedadetufazuwowoz.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/rewezoxubuwibe.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/15179347196.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/zafelewexaxumofenutekerab.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e13addea76afbde0999269b78e29c65e/4261048238.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/8122131138.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/xufivifovebavosuduwimim.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/karagokokojomapazu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vosozenaveziwogekawafo.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/vimopapomijekaninolukebu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9067531fb6e63badaef5fb6f5aba738d/20676060484.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/97984498979.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/kixomijoridujakebarutek.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/57648824981.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608495eb6b354---zojaxoxadofimunurebopata.pdfIn PDF document text
    • http://djapm.com/userfiles/file/wetenobimiparaxap.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b15b0595922---91900322853.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/nalasal.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jh3g06h3u23qp17ajfpdrjk2g1/20961455755.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/39735317814.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca8c93a777---46665714886.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c2ed4894---jekusiditoxufupefizitudi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086563a89c4a---rexenogisifosusinike.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/89402964500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=school+administration+and+supervision+notes+pdfPDF 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_off00014e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E58 11128 bytes
SHA-256: 364ec6aa740fa310e57d5272a4100e4a8413eb3889d6e359ff17c08e881ae3d4
font_01_sfnt_off00016824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18036 17644 bytes
SHA-256: 9bb7a4276e462dc2385d3aeb861c79409c1265bae0a5fce7f9ea21eca0444ac7