Malicious PDF — malware analysis report

Static analysis result for SHA-256 7572b91c383809ce…

MALICIOUS

PDF

99.4 KB Created: 2021-07-01 00:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84fbf92c68f2bdec6cebbd0c7f597245 SHA-1: c1a5411440d042dbc6e2aa2593efba0dac08bd0d SHA-256: 7572b91c383809ce8951da3200fb2e511ee2ed019cae8e4f9a0f9ccf6c9ae6e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites and are structured as link farms. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern appears to be directing users to malicious or compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b3shaecdsfhfriei03365u7mas/falerufuvikufa.pdf In PDF document text
    • http://netinflux.net/userfiles/file/piwirejijabigamus.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/82074868435.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f90u6ocgk7vtcc1fic38g7op37/gemik.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/63661955d566cb13fe8b4c98a4801b20/xegugejit.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/rekoworudixizeganabeta.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee49316306---dutamazebivori.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/503a2283e31408771ee87fa40208c5c4/8141291455.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/21538062770.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/93148463498.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/xilezibetuzajoteguxaj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0618e211cfed37ee30d7942f1d6e5530/kitenosedotezubamexata.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/77161229900.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uv7or6fhrp1amvofdjf0ca786e/55623555319.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c447bce841464594f3f5e6f339bbf8ff/womuwufaxaregugugovopo.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/bd25794aff17436482a76ff5f1af49b5/79795732184.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/9384947079.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8841f67c91---kavuxeroga.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3fff3ac1---wajokenibumog.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/susege.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/61767601405.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/sofizefefiganugeso.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ea5db1b27---85812030900.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff51de8286---70540941281.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/8589623142.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c940ff85993---lixupuxofim.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803deaccab---tewegaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+binding+of+isaac+4+dice+roomPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10960 bytes
SHA-256: 0b6149e74682eb670f63406eede1ffcb2acd9c58f875d81f1d52af709542d944
font_01_sfnt_off000122ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 17480 bytes
SHA-256: aab09511d58ec2b7692e7cd44e510c2d81481ff3752b044cbe0f7a4ad4193d3a
font_02_sfnt_off000150e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000168fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168FA 17884 bytes
SHA-256: c64eeafb45b925ccba6ce0d5890dd939898bc7490e26c7cdec5c8132600f93f9