Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4e06edd3b9b57…

MALICIOUS

PDF

85.5 KB Created: 2021-07-09 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce7a7dbcf7b9665ea850f8033b141c76 SHA-1: 8f9d100db1893b33322ab65493b56c507d5ea782 SHA-256: a7d4e06edd3b9b575d5f979c0eb64fb08ede91da8148d9ef71ba17329129ee7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=frequent+deep+breaths+in+child
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609590fe1cf37---25744424823.pdf
    • http://fzcce.com/aimgs/uload/files/71396876423.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/mopanubidin.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/2699c5158f411c2653e410fc15f468f9/parigesipig.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4nf255gs6lnml7b34l68diu9r4/xoveb.pdf
    • https://advance-pack.com/editor_upload/file/kapumenazo.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c85b69e43---38379145888.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/81725588558.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a2d63ce0---87507379094.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/690607b66436cbc1a6de1f8a9cc11c4b/wimuzanopibixemenuvig.pdf
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/e7841bbkitru7qldtqggd16j41/vuvoxizadetotaf.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160891a95ebb91---suwiv.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7a65f598---tuzar.pdf
    • http://language-coach.pl/uploads/files/59270167932.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/67cdde2834d7d22ef780011084a8df59/55963915405.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8e881e1c3fcb6464b8681adb04133e2f/5009717072.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a312f7d337c---59032349266.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbf869456---jiluraw.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gtgvnjqobblgv80q9vhbgk5i0o/gukefizarupun.pdf
    • http://tokyoracing.hu/userfiles/file/59593151025.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/maxume.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/885d40bc2bfc1524a0c08e1eb873d699/92613248420.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumedesizem.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/5f05ebbd260fd9289f90af2db26ad70f/bunefimafivebuwurisakoren.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_off0000ec10.bin
878f1c2264b1890e84c10392fb1abf75d8e80fb9367b2feadc594b0947f653f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 10856 bytes
font_01_sfnt_off00010488.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 16792 bytes
font_02_sfnt_off00011c9a.bin
efff0d864632db7b01669586f9a2089d157ceda47379e1672397b316278bbd59
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16852 bytes