Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df1d92d2fb19300…

MALICIOUS

PDF

167.9 KB Created: 2021-09-18 03:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9267baefebb3a7d9dd01ccb47ef68d3b SHA-1: 374eba5931a0bdfede09434a78181d7b31badf76 SHA-256: 5df1d92d2fb19300a014701fe8120ba05c2145e875f88b230701a7772d288905
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about the lure, but the presence of multiple external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://daisytalavera.com/userfiles/files/rikejimoto.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f407d6d3---jisixevuturiwezizu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1501l47i26kvc0vk73e2h8h9r6/43711763024.pdf
    • http://b-solutions.net/userfiles/file/tuwudolesojodapesesu.pdf
    • http://abwmarlboropike.com/uploads/files/gigatazunoweroxexevud.pdf
    • http://birdwatching.sk/media/file/40092105770.pdf
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizusupamuzow.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/42403985163.pdf
    • http://baove24h.org/upload/files/20072101863.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6f2fc77b2e2506e2446c79f0e49b397d/vazure.pdf
    • https://hexema.com/FCKeditor/file/83730265567.pdf
    • http://delannahotel.com/user_img/file/3226055884.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/bb9606f6274dc94ec525ca882d9132a2/72798807724.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/firupekex.pdf
    • https://echipamente-scule.ro/userfiles/file/91244505221.pdf
    • http://numismatika-nbkpdy.cz/userfiles/file/tadazojorubesarezumek.pdf
    • http://artsar.pl/userfiles/file/xikabobimonakipavazuwubi.pdf
    • http://dungcucaytrong.com/images/files/wagibojodafativatuxer.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16145183a2d6ef---35634772843.pdf
    • http://ciatic.saintelserver.com/archivos_editor/file/zoloz.pdf
    • https://indobaliart.com/sitefiles/file/bovezesugo.pdf
    • https://hutechsolar.com/upload/user_upload/files/wuxelada.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a27c90fd5656724d18f44f13dbd0b092/dafigidofujemak.pdf
    • http://sowiik.pl/userfiles/file/xiduwawotigagujoruvanitax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+game+ppsspp+power+ranger+dino+thunder
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002251d.bin
18b6ce14060bd115f231ed2681d9644a2df51291f428f920f4ba883a10c6358e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2251D 11024 bytes
font_01_sfnt_off00023e5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23E5E 16792 bytes
font_02_sfnt_off00025670.bin
09c1e475abdf9056047bc441f2687c64636fef6bc3d008bdbb9594a6241cabf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x25670 22680 bytes