Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3acd285398f8f76…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 01:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1089d2422f2fdb0c1d8532d9224c8848 SHA-1: 71286e345f1db4177987c250f4e6e3824fe34634 SHA-256: a3acd285398f8f7665409ceae05afca7f2acb0fe03ed131f91f172b292555ca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further supports the malicious intent, likely to exploit vulnerabilities or redirect users. ClamAV detection and ML classification strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=spartito+the+scientist+coldplay+pianoforte+pdf PDF link annotation
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abf83c3e0---82095993436.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bozenemajoxuk.pdfIn PDF document text
    • https://kuepancong.com/contents//files/32416480188.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/dijivaxegada.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/53503623278.pdfIn PDF document text
    • http://chayka-svg.ru/files/39199940779.pdfIn PDF document text
    • http://vuason.vn/upload/files/gugebedabowufo.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/sekebixuliwotap.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/95983347316.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/35506012441.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14qovl1cjnncjljar3k8gp3jed/jexidasetapavepujimo.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/favogolurubag.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/21109846467.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebb431713---59658887117.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/52976017587.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a067045d90d---losuzasejumugo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0f1788a6---65117005114.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16071d448cad47---lazunejegosorevidit.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609422c5aae32---86776041133.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/82426404788.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/63522336291.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vasisuwelor.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lenufawegoluk.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/79997992071.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609869bc0d953---45819567738.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_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 10908 bytes
SHA-256: a180c310bd08f9ffbf43ffbd3d3f8823c1c72b04956d0edf6d507f0a445cff04
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 19232 bytes
SHA-256: 98ff47a62cc1e681fc9e845a540071ffae331199fe7fc17bce5161af86073d08
font_02_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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