Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3e4104a1053c1a…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 14:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5533200d2e873f5119a582d03630099 SHA-1: 4a4af0dc217314637ff06e86b05e229b295edc3e SHA-256: ad3e4104a1053c1a1fed8488ac402ac8440e6834fd966165ab92f0567c060245
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with critical and high severity heuristics firing. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. Furthermore, it exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://armature.ir/cache/fck_files/file/13019307342.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d563606324---kovewosotuvirevam.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/towuk.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/41251163868.pdfIn PDF document text
    • https://thehouseproduction.net/file/laleligenanatoremobidivu.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/zalaloleramijezolo.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/41943565099.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/89447646904.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/vuviluworenuwaxu.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/46207539651.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/10201543101.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/2978638713.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613141a9b0cfb---nizalikasakelebo.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/95513775810.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/19670597399.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/29448904942.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/b8a482e905e2fe98e17566aa54d8485d/12706583348.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/20761920505.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/vixefetogovuzudolu.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210930192129.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/93941558939.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/dopudijobalereruf.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/xunifomofeneve.pdfIn PDF document text
    • http://noithatvietsky.net/media/ftp/file/pasuzefuzazimimimubaraxe.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/texoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+evolution+of+popular+musicPDF link annotation
    • 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_off0000b064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB064 15652 bytes
SHA-256: 6492cea400d9a881b28b13257cd7b535dedc1a02873568aa44df443b397a2882
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 10872 bytes
SHA-256: c661630fb4e8dbc864d1dc2433460d1e59d3e1420b2672d2325d2f1b4d9567d6
font_02_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1