Malicious PDF — malware analysis report

Static analysis result for SHA-256 368af769c531df9e…

MALICIOUS

PDF

90.7 KB Created: 2021-08-21 01:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99ccfa434813b10001a8cf8fe15c6b4f SHA-1: 21eeb508ddf266ef804570eac675223af99bc825 SHA-256: 368af769c531df9e29627187021f59e64b9213ae10f29df038eb62e039bb3a2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dialogueinpraxis.net/files/docs/20853122212.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3510c3ab43---92811868465.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/gewomosagoz.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ljh8ouldd590v3s6cgnr7ho0ei/demuvokejumuzetek.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4fc5d820478ac6ec1a0dda206b2670ed/53650017348.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a51b611f2a---nikivunoposipomafutinizi.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/70634049856.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/82251982257.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/62309724604.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87f8c6cb2---44856580457.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/42de1c5ecb4113dff4669a06b5070f75/zolebelotovasefewijaroxuv.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad335e741e1---79815623784.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/ralimukanudegomojepuw.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/bakezoguzizefefovidisuv.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/xiwikegatokisononomak.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/7d05903f3e7f42eafde5964d72fabf48/bulejomurosu.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/862befc3240ae850874dc266849ed18f/sofesanokijigefimo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/81d3a2fce9b51d29e15549ee024567fa/suxupuwisarusimeram.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd79fe34c1---65306120715.pdfIn PDF document text
    • http://apcmagon.com/userfiles/zitixosajozodanuti.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b62f61d653621c2bc2c24325788f2271/pejapa.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c84c8fdd7c2---74128869064.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2ad6100003576f52151d07af4a819b9e/63762732585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ejemplos+de+como+hacer+un+ensayo+personalPDF 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_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 17852 bytes
SHA-256: 8c6a7be74537b486eb6d73ad618687afdf4b8286ce623e199ab2eaf43033f8e4
font_02_sfnt_off00014195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14195 10916 bytes
SHA-256: abdf381149c86ea68843e534f37ba67143c5b99b4bcc21f495d99e617ed5af70