Malicious PDF — malware analysis report

Static analysis result for SHA-256 d294e489f831ee83…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 11:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 775a944dcdce0310d81bda89992fef83 SHA-1: 1db63b99fb8d69d6019b24b01c4bdbc9f8cf2462 SHA-256: d294e489f831ee831c3c18fa068c847c7f794d673cd9f7e595f2f8bd45e4bcf5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, many hosted on domains flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://viorina-deko.com/images/file/69081393844.pdf In PDF document text
    • https://tempegaring.com/contents/files/11989235505.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/61632511165.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xidamerolevusajozego.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/mejerowaxopadizanukupib.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/gobanejibinaviman.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/zowuferikanazakafamijoli.pdfIn PDF document text
    • http://dogable.de/userfiles/file/12928027322.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/47814999338.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b161a080---furobewaguzuzuzod.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pifolapivawutupebesas.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/luwitezomopugifojatudu.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/lixofavejexumimerifisipim.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///sujivedepejuwo.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/kixanebupifasidixesux.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/94357330970.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tominewiguge.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/82652d22345270b7564fa52fbca70d1b/91985304559.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4a07e01d01fe60fbe2adc8569e11c9df/kaveg.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/27258682731.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/pogakeni.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/zezurem.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/20537954277.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/96366429158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=all+the+guns+in+fortnite+right+nowPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 17720 bytes
SHA-256: 3fe6e4edd0b849cf6ecbd8a6cf58add5c6deae31e87f255fb12ced362f40918b
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 10500 bytes
SHA-256: 41cd1573aa6bd55e0284d49322820a95e2e1bad20a6db06bd56ed3c07fa61b15
font_02_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1