Malicious PDF — malware analysis report

Static analysis result for SHA-256 c843ba76919d2a9e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 20:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd6e0af113266e201c21c85ae30e605d SHA-1: 18fb3dc197d2f9e325d9d2f5e5765fd9c8efc4c4 SHA-256: c843ba76919d2a9e8e3b0d4d7d07b90884605109b131f1fbb91eb1f42c8e9400
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inprovitbrasil.com/ckfinder/userfiles/files/zexesutujomikosafibakuf.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qljnglt1uj90j0lltq8uniktt0/5676507721.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/zojokuwurukapomefonuxuf.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/jasejopotokuxofulibonevez.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/90897526274.pdfIn PDF document text
    • http://taigesw.com/upload/files/jemuxamiwerupatazer.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/84248456397.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6542455e9c4a9e9ca39e0f27c23a840c/92785049284.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/kakosexosad.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/87215844560.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144759371a3e---54841807712.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24289676341.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/76227246260.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d285b092c247f5135e005f8305f7a0e2/sedojokejuxukil.pdfIn PDF document text
    • http://beruanglucu.com/contents/files/82942209627.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/32091346101.pdfIn PDF document text
    • http://www.agot.pl/upload/file/84910035470.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2fe6ec57f3739e016088a4cd28eda7e5/55790029840.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zoraji.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/59943462026.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/63879749288.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/82294541901.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/depijosafamonaserulap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nds+rom+pokemon+schwarzPDF 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_off0000aeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB6 10756 bytes
SHA-256: d847d7ef795e4674c5491d037f7283f01a31952acb6d7abbf276012ee68c7b0c
font_01_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 14580 bytes
SHA-256: dd558aa6726277cc2690f480f15e174173c102479620bd1870b5572001c2001a
font_02_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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