Malicious PDF — malware analysis report

Static analysis result for SHA-256 8821b171a1ea1481…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 00:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6395f12175e05080980f6ea582e83e9 SHA-1: 4758392c0d1fd4302894d0c2b084d3fecdb67e3e SHA-256: 8821b171a1ea1481e4bed02d181f306dde68d1d054d7c158e1023abc9998027a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, suggests the document is designed to lure users to malicious sites. The specific heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=novel+wonder+pdf PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138017c07575---53868536583.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/75137726866.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pujexatowufinifonafutoli.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/59587788833.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/58271065293.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd9ca1c38b---lotajakewarexi.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/4997811078.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613522c5aab20---fikubijawowuz.pdfIn PDF document text
    • http://tradotel-riviera.com/file/1859742657.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/51783254251.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/karupewego.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/vipivot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a77cc731---62141256645.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/mafagarebotobaku.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/suwukapiratetijatur.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/fujutiliponena.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/55058449209.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134a3603c728---59448964238.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/91874098940.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/38710039172.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/jexifonadose.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/41057418539.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/serotixepiduduj.pdfIn PDF document text
    • 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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10100 bytes
SHA-256: a8d183b1949834b7cbf0205e83386f4c51ea044e6bcf053341f073199661380a
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 18012 bytes
SHA-256: 80099d1bca08431b90c7ae90880382d688bba17f781968abc05b8cdb4a8fc17e
font_02_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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