Malicious PDF — malware analysis report

Static analysis result for SHA-256 0523cb7a1f09f7ee…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 00:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70ee60bc88ebe279e2e08681b8435c4e SHA-1: df93100edf9e7921a7ec297196ed9cabc615ed3b SHA-256: 0523cb7a1f09f7ee85aa5924efba03a7eaaecc76afbbadc22cdee2ff9fc24754
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates potential execution of system commands, likely to facilitate the download or execution of further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=apk+installer+for+pc+online PDF link annotation
    • https://ceral.pl/ceral/pliki/file/17167376967.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9de51307---mutojomepuxanisipe.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/10859055898.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/nejujujofoxojopuwupazozeb.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d4f43d62---30503953276.pdfIn PDF document text
    • http://chenruichem.com/upload/files/donenigamanodifupowug.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614394a8a11d7---goluxazifipupuveduripa.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/zegavobubijagezemuwi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/81458717202.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0290nqn3p9apou4e2cra0ra931/91787439888.pdfIn PDF document text
    • https://nevisnews.com/userfiles/kovomeli.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/42492739961.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/92654321004.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/juguxovojosamedebiw.pdfIn PDF document text
    • http://simonide.org/userfiles/file/70587561640.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bozozewilamuvezagulawevu.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40031987365.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/9534620960.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc8f32ced5---67858398385.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/jerenisisutoliv.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/19043877660.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/27064903098.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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 19012 bytes
SHA-256: b189650639a3dc45dbdce21124eac23421082030f5a984428f098fd244b9e15f
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 10548 bytes
SHA-256: f4043a2934c2fe942bdfc6ab041cb2676c3a5a75b7afe60cc2df933b8a26f66c

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