Malicious PDF — malware analysis report

Static analysis result for SHA-256 1674aec99e6de79c…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 18:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0cc68a4ab83951abac890bb64b461c5 SHA-1: b4bc90ddbc72f119ece6bce999a6a13dcda4f00d SHA-256: 1674aec99e6de79ca1701e20c8c9486e9e86e0b2ad2f35e96314955858d5cc35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://pixomot.ru/uplcv?utm_term=best+apk+mod+games+for+android PDF link annotation
    • http://benly-carson.com/product/files/supenijiwomufujorakojalu.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/71870553888.pdfIn PDF document text
    • https://istanajp.net/contents/files/buxosolesesafe.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/bigesifuboxufubabuw.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/jibaforigasigowaseve.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jmehr5v9sr1f2ie6urgobvmd93/wuxano.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/75901304898.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912051236355229.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/tibesedonusagekegukewuwo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lesuzuwikikeluxob.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/bagupakarex.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0785ded81---69712220003.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/genenorobifakakekeridaw.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ff7eb86f7---jokalojolurixibogejun.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/wirumudonofibifugo.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/badowagokob.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/newiropiwipijazuvaso.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdaa87997---mobaxuxob.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/73640307281.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210910052709.pdfIn PDF document text
    • http://ranch.pl/files/file/kavubixowajig.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 16752 bytes
SHA-256: ac8276d71e7882080554a790fee52583a57f8e86ac19f388b0bae307eb9108fb
font_01_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F99 10940 bytes
SHA-256: 53ca11fe4eb00cc393ca5dedf34ee9e3f46a21a19854bf0c9ef2c82e4c7dda5c