Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc733a99fa436af…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 13:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d646324bd6d471e00cfada81c6e6d26 SHA-1: fb43e94c89d840bcbbc34d8031d000a666077e5d SHA-256: 7cc733a99fa436af61d7158d5c547f4fa9b8276fbccab57fb4f5b3c834dcd478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074a415076e2---35967071445.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a74443ea1---vixowopexanewedipasaxul.pdf
    • https://sanagustin.cl/files/20980057345.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34fe5cbbf---muwadomiwejewumarori.pdf
    • http://geojeoceanhotel.com/userfiles/file/20210812025257.pdf
    • http://sbs-group.co/userfiles/files/93890664560.pdf
    • http://ibtaker.ps/userfiles/file/47151289268.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/cb96f7686df2dae7dccb2d8c79f0c2b3/11408035286.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079295d5de10---nazulunigajez.pdf
    • http://marta-galan.com/files/varios/file/tidezebowewowavok.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210903_F47B3B2E88FF6E08.pdf
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/77909974166.pdf
    • https://exihomes.com/userfiles/files/vakodo.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c7bb10e14e50d012294d8094abdd0d69/fugojapezokasuzivud.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16111606d7661b---48046741845.pdf
    • http://ebiocell.com/uploadfile/file///2021062805234821.pdf
    • https://pmeds.us/userfiles/file/40093490316.pdf
    • https://alohasafaris.com/files/tozasonip.pdf
    • http://3dtechgroup.com/uploads/image/files/72539032445.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fc76424bd832908b29617710275a861b/davogavawabazafu.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/9021799436.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/llq60kgsijduolmdjltb3fg4uk/67429399193.pdf
    • https://adikkeempat.com/contents//files/kupalibofapefejirexibivug.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bi2l3i9q25538iq33qkbufkt16/zokidanutitonofi.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6a2bf9b993ab9e9976458eb9276322c/rodesevabogubukegasiso.pdf
    • https://zenithoverseas.com/assets/userfiles/files/37825422530.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zazarated.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pros+and+cons+of+ketogenic+diet+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 16792 bytes
font_01_sfnt_off0000e780.bin
5c1400a32c74d81d2795ef1f34872d3cb4a0723bf3192cbbf4c60c5530dd2e31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 10840 bytes
font_02_sfnt_off0001007d.bin
8c8d138296b0bf9e58c20239a4188bdd1cddb382af147d9318f2575aab903200
pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 16976 bytes