Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46e01d621441dc0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 11:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 924ad45400471bcd9263713190f79417 SHA-1: c927006916c70903b34695beca473ebdb1f03a72 SHA-256: a46e01d621441dc0fea0e0d1e62fd3b2fc3ee4c5ded2b9de3a0ad79889eb43b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=minimum+volume+too+loud+android PDF link annotation
    • http://hitecds.com/userfiles/file/83591409655.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/44604103568.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/16038375846130179e4f0ad.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolozepup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebaa22a75---5496909539.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/bekisikaloni.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/68988001996.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xeruwanu.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/dazezokujobefun.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/vokam.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/94842733296.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/gojida.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25202928371.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/61020385776.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210913100502.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/97392048515.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4adqnbduavsd872qu6d3igo23m/gekoruwujojo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/54778112828.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613682d7dbd7c---wafemamokoxona.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/kuboserebijaluzipezatuzu.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/29596151725.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/nowufi.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/60701025482.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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 19364 bytes
SHA-256: 211e8c65465e72b32b75d6e7d3979bf09fd23704ef0e07b8887ac5c5f190698e
font_02_sfnt_off00013616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13616 10400 bytes
SHA-256: 1cd25bba3b219cca99cbd83079a494b44c9f72404f53a73551aa28d48c25a941

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