Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c8e08dad9146fd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 11:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f39904e9bc06e28401778e8d4dd7056 SHA-1: 7f7c294ef35718e82516412031a3c06f243830f4 SHA-256: 94c8e08dad9146fdcebf2be9e1c7319d9b0671f86b1aac5d4c87fab276c32663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests a link farm designed to lure users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=highlight+cover+maker+pro+apk+2020 PDF link annotation
    • http://tndgdemo2.com/ckfinder/userfiles/files/vevesisozuged.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/74559986033.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/jodasesogokitekij.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wuxakevodeludebed.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sma9ouob26dga8broiuufvg30q/redapoxotazotifer.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/nidexetovot.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7km3cl5bjblglohr1rp3s6it6c/mukumiganisosobofusik.pdfIn PDF document text
    • https://kueapem.com/contents/files/zidubutudij.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/54945663045.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/waposafelete.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18a7cd4a4---bidip.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e986a8b40a---85389134035.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/depatatokotedaw.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/80188820398.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/taxedowutadixowupirozanop.pdfIn PDF document text
    • http://darstin.com/userfiles/files/64796106757.pdfIn PDF document text
    • http://fkhd.cz/data/img/lodus.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/pepagarewidipefugatiped.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a680d809f---sorilumesulowodijaz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613caddf38d88---dukebedelowez.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/53588175536.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210902_CEAC7CD721BC7605.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/vikenemazufelajuw.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/liwevotav.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/mukamaropavulofos.pdfIn 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://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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 18328 bytes
SHA-256: e020dc9ba67dac0571f5b1f9c5cd6ac2a80df0c51a2b3cbf57f87e116d0417e3
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 10940 bytes
SHA-256: 923b4f3e5f2be121663db669aaae7b1ff21b4913fb0de0de3b5970b6efdbce48
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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