Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac8f4f6c2a3e7b1…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 03:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba3109d35d39c7dbcebc95b235e7e6d2 SHA-1: 6b935174dfd89096cc466f9803834475ba5b8daa SHA-256: 7ac8f4f6c2a3e7b198f6d79043a3f0febb371245f836941f3ca34e9f576b13c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded links, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=first+grade+reading+worksheets+free
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c550dbd54b---ribipowuveniw.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/777101a520e6454da4cc3a79449b8cca/48224816523.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c882f1608cb---71334345457.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609fee29a7606---12722379248.pdf
    • http://playbabydoll.com/userfiles/file/19821512134.pdf
    • http://keralabiblesociety.com/fck_uploads/file/kaxoke.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0e7c28969ff0807245cf2c04bfac6bfc/24758941242.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160cba67eb241d---66173323869.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8185ea33be8156e69e84eaa9dcd7d430/79024692791.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c4242a4618f---fipikinubifije.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16098310534fb2---69271556319.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f84203abf---56207370816.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10aede94c---13286493738.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/wuxod.pdf
    • https://dacinsara.ro/fckfiles/file/26309422436.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mks9alf8rnkjtcge3e0pktbv63/dafowoduraxedoligasoko.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rub0rqqujhqqrt3pv9hfd4iap3/mixojukexoxivalusab.pdf
    • http://moon-villa123.com/CKEdit/upload/files/fepalexebivugat.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095af8a43535---lexixonuj.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/0469eb9074d6fcc35ac6e71d3118d8f9/wikixebawirikeniwipuko.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a405b8ce5---96869460111.pdf
    • http://fine-cottage.ru/userfiles/files/71156850786.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ed2a80a9---11557255100.pdf
    • https://melz-feu.ru/upload/86668860567.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2nrp189iie67alkm9ogh1tabvr/vapusiluwojenadaberofolej.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_off0000f9cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 16792 bytes
font_01_sfnt_off000111e2.bin
db2989eee1faaa52c6be9fba8e965503db40e7ab20fa34faaec253b6706f5b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 10740 bytes
font_02_sfnt_off00012a5d.bin
0761cb345ad3e2c8f91ca2d18cf30585b3201265133c4ab4b8ef45914fccc8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 17352 bytes

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