Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a0efaae076e52c…

MALICIOUS

PDF

98.8 KB Created: 2021-07-25 12:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be6fb6230ef569cd126e27fe7f536e86 SHA-1: f75016d7e57695a1aaeb3824fef272ca123a4f6c SHA-256: 53a0efaae076e52c3d31079e7a98146361d69fa8deb370afa760e654fcce9323
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload storage, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe1e0d240---xepamejotilerigisemujur.pdf In PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/77637509745.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741da6914a7---kimiju.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/95430125669.pdfIn PDF document text
    • http://thegioioto.store/upload/files/tukejoxafa.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/43165496509.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/kezuberagutefulixe.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075accfcc1df---15970489174.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d09ml5938b3fmgadnrr55dsu2g/vonijemurevabumajaj.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/67277168425.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/buluzina.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/wakofudawifufib.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n855tmft4kq8b846qh4bjrg2tv/mosasudame.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/gameromerujo.pdfIn PDF document text
    • https://dineflon.com//files/48856101990.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/unt4lfad7u6nb15fsgo8k8i5qt/kojisezaliwusote.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e833086fbaa---puronum.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/30021714919.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6cbd95dc0---7583904992.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/0bcad3a38e5a6734971435493285c3c6/likujumapejokoluf.pdfIn PDF document text
    • https://ovalpolycoats.com/media/44773119348.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/89935755354.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768abeae740---lunuvananuzovelovagato.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/66604136851.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/watuzitoxolenabiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+the+symbols+of+christmas+and+its+meaningPDF 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_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 20048 bytes
SHA-256: 97221278007e19a93ca0f6a89f7b1b5b0d4d14583724b82b54def3f448a41cd4
font_01_sfnt_off00014b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B02 11172 bytes
SHA-256: b63f7f43cdd733a386257f6c7353ae52bcf060fa7a5406c25a5b51fffefde8b6
font_02_sfnt_off000164c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1