Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a12900aa0c0ec0f…

MALICIOUS

PDF

90.3 KB Created: 2021-08-19 02:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7063cbb014f542975bb624a94aff389 SHA-1: b62a28112a1c12603f5eb8db072e9212f241cabe SHA-256: 3a12900aa0c0ec0f02e0939393b51889ca08db8a1488608111c3dbb13b4cb63f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. This suggests a link farm or SEO poisoning attack designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d764eedb8a0---61426820805.pdf In PDF document text
    • http://karlsbach.de/userfiles/files/vagoli.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/68313628251.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160759ad57ab78---sonun.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/fawexafasew.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ce34bf45c6b27c1be8f93ed2c1f66f7d/96150627942.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/fukogadibivarajuz.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/jewuzifaneraxinorowijor.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021080902303173499.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacc6616f77---64946972277.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608890d405961---vavijusatidiwera.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/85977320851.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcc147e77c---dodagexego.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/visatisajawurapogupiri.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a9ff49167ef7c868316ba45214f16409/zafaregogiz.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/jdo0eo1glqnchdehiogsgnko53/91165358832.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/39835324861.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0ac5446afefc297de0b0ce3090c135b9/74485357367.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210606_055929.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/3815837473.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210815201437.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611cf0e06b8fd---24874486188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=why+does+my+dog+get+mean+at+nightPDF 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_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16648 bytes
SHA-256: 4c7529af687222db2598d19a2644aa0690ad1bc18cda2b4b3f8a07c2192c3405
font_01_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001434f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 10656 bytes
SHA-256: 5b0ae4aaa70ba8df3d449aa5aa36b5d13bc4bd71e2bf8f32901f094bf17e9ec9

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