Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe56a1c85acc7c4…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 10:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 544946914a98654b5f3871c088ec925d SHA-1: 513bf643e37a08499f418c4af7e576a2a3bbe3fd SHA-256: afe56a1c85acc7c42b928de02e8e86b1f60ecc02baec9de5a755a4401d3fe900
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised websites, suggesting an attempt to lure users to malicious destinations. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chuaphucluong.com/uploads/image/files/36214418662.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355d0fdc51b---jisokojowipavujosozu.pdfIn PDF document text
    • http://alfamar.travelshops.pl/userfiles/file/datiluri.pdfIn PDF document text
    • http://spiregene.com/image/files/20210912_132912.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/wikezijinumalodurire.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/jerekanefera.pdfIn PDF document text
    • https://reha.bg/content/upload/file/40701207817.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xigiwitofovapovi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/mijamujorupuwurojeko.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed87b7a07---pipusiwikujiturato.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/nojupuxek.pdfIn PDF document text
    • https://alkoplast.rs/files/fiwafa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134080a834ce---megebaraniwezedalajis.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/93655798684.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/safugukutepezotozobaf.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/76966968648.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/79030482615.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/loxunivawemo.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/64353731810.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/90622326192.pdfIn PDF document text
    • http://hingliltd.com/userfiles/xuwoxezewasideditasaja.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210927115932.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/49659415245.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/9766907272.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/81939975451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+the+new+mutants+123PDF 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_off0000af85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF85 10660 bytes
SHA-256: 63ab4529fbd9d503d8604e0c64a36dd635a6b7c3bba8953eb95b20b5e6ad4669
font_01_sfnt_off0000c7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 14336 bytes
SHA-256: 8b7351cad3a8c805c09cf6a279659d95e086a4fe40542396e89d850344640e84

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