Malicious PDF — malware analysis report

Static analysis result for SHA-256 939fcee1ee7bec91…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 01:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e67c434d281f50f6c75831dded0b1a8 SHA-1: 384cfeb1e69fdb8ea8bc45d94b777c5e97b959ec SHA-256: 939fcee1ee7bec91e19c8ac7c197c1561efc0163df942d2cf6cfa5fe89e444a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krakow4you.pl/krakow/files/deduviro.pdf
    • http://sonsuadogo.org/Images_upload/files/3186955379.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/34978590750.pdf
    • http://carbontuning.ru/file/fanusuz.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150e1f2d5d03---32619977387.pdf
    • http://www.ferm-matic.fr/upload/file/43917529793.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/8689668858.pdf
    • http://ziconiavip.com/uploadfck/file/21544426704.pdf
    • http://stroyvodservice.ru/upload/File/vitajukaja.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/28891418324.pdf
    • http://brandorbit.in/userfiles/file/zaxed.pdf
    • http://websurin.net/UserFiles/File/98099217698.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/38407837886.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59963355515.pdf
    • http://mientaytourist.com/uploads/files/69788509899.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/386ba0679d41226996677216bfbc45ee/dunazemojanurubovigesij.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210911031935193.pdf
    • http://magdrywall.com/project-new/christianbook/upload_images/file/perimo.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/42ffb3ede2c8043a1ab1d3e5c4b4c977/35525644995.pdf
    • http://jsqnchem.com/upload/files/xukozulil.pdf
    • http://vimar.ua/userfiles/files/tosewiva.pdf
    • http://studio-rivetti.it/userfiles/files/75623785129.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+mini+militia+unlimited+health+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b114.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 16792 bytes
font_01_sfnt_off0000c92b.bin
e97eaf2bae2469707d0311f3cc2e300b31036238018099023b6a60a778ae64e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 10668 bytes
font_02_sfnt_off0000e160.bin
ec7e5540489e3addb210db286670a83a775fb40ac045e7d6d532aa8dc902012b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 15184 bytes