Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d003e3910edc00e…

MALICIOUS

PDF

82.5 KB Created: 2021-10-05 07:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0ddb9192a168d203ae378c60489be1f SHA-1: 1e7f0c0ba1de9f52eecf3b2caf6267153c23d556 SHA-256: 2d003e3910edc00e60d66fd4a3ec4687c3ec807a6993a2abbbff17797a5267e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://clingac.com/d/files/80785161964.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c1687bf2ae492ed148357a9e39e53669/jebapa.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/10356076294.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/zerirabozojufipetofit.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/60784254512.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/31223452627.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e16b76bc0---7018139538.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/54362411430.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/3809490216.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/482945512.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b959daabb4---99613957670.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/ditavuk.pdfIn PDF document text
    • https://mbbs.hr/files/lalavizodawefuwoke.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/fuwen.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/xazugidugixixamizepo.pdfIn PDF document text
    • http://bienbao.org/uploads/files/44796712182.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/74003119473.pdfIn PDF document text
    • http://hzqzg.com/d/files/dorerejepi.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/dunolimipele.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/befipiwalejaxev.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/nutixukimuvirajit.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/nopimir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=planets+from+sun+orderPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10524 bytes
SHA-256: b0c9136f92cd747d8692d5826be3c5631f2a9e26982cb93dba36482085d30407
font_02_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 19256 bytes
SHA-256: 14f775fa3d7d6a319b8a83fe9607ae731406f87e52d0bcfed9aa1db5c4401b43