Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d046b48cc79167a…

MALICIOUS

PDF

292.8 KB Created: 2021-06-13 12:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b1ec63a1271c4d303ab3b456023f23f5 SHA-1: 68d7c74f351f2646595903009e5b517eb143f09f SHA-256: 8d046b48cc79167af57d060d58fcf9ba7374a5a4f74cedf12fda8e627fe90c67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=read+and+write+hangul PDF link annotation
    • http://kagoshimakojintaxi.com/userfiles/file/nepokewati.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n1su3q4gmvn281alktheeiarhv/vuwukozuxepatarotusorerix.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091160473d0a---menozovakodoloxujuzubale.pdfIn PDF document text
    • http://rld-carbon.ru/file/buraterebufelotiz.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/67c0c3a9a4b32a9e787dd09cf68c69cf/35345621864.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/07e1539c97c34de42327b555d4af2aec/91348428417.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/80784178713.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/nexusimud.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e18902f2a5790e610790f54f5667aa89/datutonan.pdfIn PDF document text
    • https://papiratisk.cz/soubory/94574405071.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb1095379d---92781630012.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fe168da3d6950d1475c27945138f1045/69805227471.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16086eeb6a0c79---19836871044.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fipoxabagudilu.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/zuwotugimevo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00029d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D66 144524 bytes
SHA-256: f3b431dcaaba838f1a758d5ad1bfdbb9b2f53443196fa78d303713ec640ea555
font_01_sfnt_off00041037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41037 5008 bytes
SHA-256: 3f7e4c0400aeb10e8fc3ea30c310c8dbd98f6e0ed813abb7c6c132211f0d4b72
font_02_sfnt_off00042152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42152 8532 bytes
SHA-256: ea35808a71e97665288bb224b1d8c67e501d47d7e55d704b0c8bdbe75480465a
font_03_sfnt_off000431c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x431C5 20088 bytes
SHA-256: 303946ba310d84d4649c95481998f5b502f5e6ac38d61d8d8c6e7ab8111879b2
font_04_sfnt_off00046e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46E76 16380 bytes
SHA-256: 5b7811194be551f8240c32daf2150f1707a7dff3a8879c22c3828a206df80b40