Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f3e4a36ce529dc…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 14:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a3cde4fdf74b0e537f559e4d0ff0ebf SHA-1: 8a305c9d840dde960a94c6d5f79877ef70d77c05 SHA-256: 29f3e4a36ce529dccddc6dd2c5b7f6fe444e531375139ba8fe2caed8ff940b26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/36745821697.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/vemadadupozuras.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/goxelidozujukufefa.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/47072314240.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b6dbubmlhgr3htjiidof03utkh/xozidefajufujefakabur.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be493084c23---49288675692.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sidefaxegexej.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a2b98a52578aaadcbaf18fe16d9ef655/gesopomexur.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/83517666046.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784074d7989---wetifemamutox.pdfIn PDF document text
    • http://hitpoint.tw/userfiles/file/111401218.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/9953406040.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208e35acad3---6365489003.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/70316581346.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3fd90e9299fc32c413ce3aa482f25b65/41853756620.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba061daba0c---25516642559.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621073344.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/dibolil.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/57700219675.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b19aadeff58b09193038a138841f1136/59888476590.pdfIn PDF document text
    • http://farmina.ru/uploads/files/pejove.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/wigokowidegu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/jogakadigafa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/h6k9g08emf53q0pg9t13jct4s5/45373753773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=skyrim+how+to+become+a+vampire+lord+without+dawnguardPDF 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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16608 bytes
SHA-256: 79e41e871d5bfa1c3edd1fa39de9766c20fbb199132da05925df81d2adbc6a23
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 11464 bytes
SHA-256: 5e045533c4e634303fd0fb8f7a8181ebd8bfb45f267454315cd5dc9f672f5e25