Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44ffb3a7cc425da…

MALICIOUS

PDF

83.9 KB Created: 2021-07-16 02:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16a6c1a852606510074961a628541b18 SHA-1: 0a44291b078907f4c3d4d836cf2b283f3a523bbf SHA-256: c44ffb3a7cc425da6a1351229aec44280f991a025a4848387a862ec0d426bc2b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=simpsons+tapped+out+hack+old+items PDF link annotation
    • http://aftckwt.com/uploads/file/87542793367.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/26l12fpdbsmbfmonh6rqog70e3/92371412499.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/fejaguremafemujimix.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/tigumepupixejukasa.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/nipelamakisekomanavajetip.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/htrp1tanbda250a81arc5r5t41/65678083197.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90fe289b54---22375161942.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9562afbb1---vuvuxadef.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b0a116c4127698f273347ef64dc67330/vupipoxikojizuve.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/g2t2412pipa37rn8c3fthev7o0/8649919407.pdfIn PDF document text
    • http://jarosi.hu/files/file/wutidewo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6e65bd1da---90151063449.pdfIn PDF document text
    • https://ebooksweb.net/files/file/53849341781.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097d7dea6287---25480645038.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/junaxibatipigifupumixeje.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/tokosebexupilomikegiv.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/449f8deaaac3ddb12e7935e0e5946526/loguvafiniwawewakabis.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/o1o250bq640ppd1u985i6hodd3/58998718998.pdfIn PDF document text
    • http://kfbi.ru/content/file/91587630720.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/24eabade777bf8d3a6372e1010e49883/zuwopugesa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab773f2c1a2---86606877056.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/556e91610c138d8fa5daacee0340c3ef/21485886485.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/29433109490.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c0ad70f8---kexatulelosuna.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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10948 bytes
SHA-256: 32b20751ee32842adea2649b66305116da021217d41aa1d8a71ee7619d521e9a
font_02_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 18020 bytes
SHA-256: 411b0572a1a413cfb5a5650b0d2ddc17f6c70ea9c55833a9c6b61ce62e3581fa

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