Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e2ef8f4c4cf461…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 19:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c147ffe021a4e701d0e71108ceac35b0 SHA-1: c9270c5fa79ab5c2fd20b9c57e68e69c74b67b26 SHA-256: 40e2ef8f4c4cf461a6d45fa8eff7bcc41a026cac7cd80bdb2159ba3e457d4442
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files hosted on various domains, many of which are identified as disposable or compromised CMS uploads. The presence of a 'download button' heuristic and the ML classifier's high confidence score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure and URL analysis point to a lure for downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://mbfeed.vn/upload/files/mukojepafewomepu.pdf In PDF document text
    • http://suaups.net/userfiles/file/6886486475.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/digupidewetiwifib.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/gepugemituragubozifalif.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/xoxuzu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/799385b0247ce8e154d9dd0023ed3f1b/xojub.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/c28b05bf1511e2d4803111add40583b5/domezijixub.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/32173981328.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/takawusatavipot.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140939711188---xufavovutomapawipujafa.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/rezije.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/gudegafonika.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/lorupefonaxipujoj.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/77135855664.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/19311658798.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8uq8t6gi21u8tbk2v2ruje7kn0/943633879.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/5257549324.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/wuwosulonirudiguvitaraz.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/47002654343.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/mejupuruxeded.pdfIn PDF document text
    • http://kccmaul.com/files/files/95717360889.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/ratan.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/83820959487.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453cda449e2---50070995141.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/44137215967.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/99264352790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+san+andreas+download+in+ppssppPDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 17108 bytes
SHA-256: 9ff294511a633b88a420ec70cf915367b882a8d169c82da7fa566406aaef04e7
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 10508 bytes
SHA-256: 5f549ce465bd17bb2248a41c6995f7e02b259c9e13fd7a60c44ad4ee356ef1d6

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