Malicious PDF — malware analysis report

Static analysis result for SHA-256 905b1e13f23bcf16…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 00:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69fcd859d0d26a0ea432bfd8d1fdb0ff SHA-1: ae68d1538e94ebf01a730f235c7f0c2c29720fad SHA-256: 905b1e13f23bcf1658d02217c104ebe2356c5dc91e7cea5c44a30f6f29a8ba62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=tamil+mobile+movies+mp4 PDF link annotation
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/pifetazukoruxine.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/lanipepiv.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/57394216955.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/84355569605.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/newulameb.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mb3edk5c7iug15id200m6nil5u/28997493876.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/97593853246.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/weroza.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/litevepavulo.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wonoz.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/xosedepofonusudofeju.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/511e5119b2e20c67d6fc8dfd30e183a4/27973743282.pdfIn PDF document text
    • http://keacg.com/upload/files/miwosekina.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/fuwikeb.pdfIn PDF document text
    • http://akilanews.com/ckfinder/userfiles/files/12048148264.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/21974421740.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/rb5kf60bbbd36kk56sq3u3slbj/12751671421.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/6077254386.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/96088004543.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/voduja.pdfIn PDF document text
    • http://salt17.com/userfiles/files/durijidonuzovobalob.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/kogani.pdfIn PDF document text
    • https://protum.se/file/33907661318.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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 17908 bytes
SHA-256: 7776a64f5aa50259d8eb051d157fe7bb9cebbdb31af7d70759a9acc5e7e9a23e
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 10360 bytes
SHA-256: 5f9a55d126cef54112edf4987b009d08e5d50f7db3e7bd3c1eca9bc3533a6708

Open this report in the interactive analyzer, or submit your own file for analysis.