Malicious PDF — malware analysis report

Static analysis result for SHA-256 4150b4c09bdbd1b5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 07:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 793d4eba755971e22cc648546f9bc9de SHA-1: ed8fe776cdbb4a0cc493ad9d568d9467b2432986 SHA-256: 4150b4c09bdbd1b522c8027908d6c116900397f2315f628993e8a0e255a4f810
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a social-engineering lure, instructing the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The presence of numerous embedded URLs, many pointing to compromised CMS upload directories, suggests a distribution mechanism for further payloads or phishing content. No scripts were extracted, but the overall pattern points to a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://oniceh.ru/uplcv?utm_term=install+apk+without+developer+mode PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/236f073a1e2d93f2c128301fe263aa86/zajukumolemimarara.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lebugogugejizozojetu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613379aa24c06---98361698736.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16146ab9452261---58083658451.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/88984452904.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f5594af8a0cd79f6eb098f071f816297/silejofiburiwasexufupipab.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/xasozabo.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/mazujupositujabemuxikufu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/23195836604.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6176356346.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/18248921675.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m09pi3dpuo58tpe8kjq2qboea2/pinupako.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109110208108794.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/79522803415.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/zalolokis.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/natug.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/tobadam.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/79723607471.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/77665318098.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5a82662c---dajinogupewolebapakemobaw.pdfIn PDF document text
    • http://anm-av.de/uploads/files/69415113028.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/10710595704.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/58277955987.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/75248274397.pdfIn PDF document text
    • http://www.etoiles-recrIn macro / runtime command snippet
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 19056 bytes
SHA-256: 860e2727bf9b65543e1906ecf0be2f1bf84d11e51f5e902a7e06fbd26a62d833
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 10952 bytes
SHA-256: f5f86e9b62d582e438ff3623cf1d1ca1d479a073abcd7c9f79e0a477988660ae
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.