Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d77d24abb02ed2c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-18 21:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 3267af33b8dddd29e889a68465c4bebc SHA-1: 235f4036c7998f44283b9c100e4c174cbc92f67c SHA-256: 4d77d24abb02ed2cc6872a2443d1b13c71eb435c6cd62ddac59e42149e7a98c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/049cac83060ff378c1093dc493b8e09e/58207366825.pdf In PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/tizanotibumiwudorexo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/aj72j17hn3cpg0ajqj9naldk1b/59368089439.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/tukatesugavoxaxezanazu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b6d0p128vcid2lert3vrhas287/70949191378.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3ea84198532e1df0e13a0cb2016e748f/62372903359.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n9om7ksnm5teel04l843g7eo52/bujajarip.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a305226a1---92262878645.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/90842309057.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/mefunarofili.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160752c075fc06---12953874602.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d4ab58b0185a87e7ae17c5ab2b4e3fae/63738300049.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a2ab7a82f0e188257bc5a898e9e81c38/65480934181.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/fubolexirurimipofipo.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/opskiu8pisou09tb84jrq5pvr3/mumob.pdfIn PDF document text
    • http://gibisch.com/files/files/67699177324.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/97777266587.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/89053597490.pdfIn PDF document text
    • http://sport-way.ru/img/file/90278818931.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7de8f2d5dca02d72ba4f4d025d010b72/93766733391.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r7oitrfa8r783suodc40gu5lb1/54031939969.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/g437n3ef7nu2e0dmv43c7lgpa0/rumatepoxon.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a12bc01c5---zibunisoxotalukiwuwarokep.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/lazirujaxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gamers+gltool+free+with+game+turbo+%26+game+tunerPDF 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_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 17024 bytes
SHA-256: 721ba828760d52bf99bc74bf650ca2f3def94091a38cfc37d9ff94e2ccff703b
font_01_sfnt_off00011d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 10924 bytes
SHA-256: 9bd09b62e13e90ab81469850915532a5fe3898d7aad800e0cc4b3ad05370e10b