Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be9afefd82175ae…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 05:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fcbb29de7878c9e6a1f718d161e66f9 SHA-1: 764d45ce7dbd624983be38b2aa8c8a16c9808a02 SHA-256: 5be9afefd82175ae2757a5d5a4b188e13a120391af2678306571c80e7fee5e8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ilyxrace.com/userfiles/files/23339313976.pdf In PDF document text
    • http://feynburg-uhren.de/uploads/wuxadopufokalibu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb2531fd9---mimikegevizunot.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/769ece2a905663e8146eac2a883dedb5/komisukolezatajesovum.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/78593594345.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b98b82653---kewosiranifepined.pdfIn PDF document text
    • http://teraval.cz/res/file/34490348079.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/fujuzunerogetanupufi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d9ce110c---joseta.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d61643fbbb1415398321636c03d18b77/6392923752.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-15/20210815150224776064.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c23516b6b28---lobofaburewivonawebewizu.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/16659864660.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/30452834486.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/julefodokogubowokunomasub.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f72219221d68b1276d12e7ae26ce819/13940988970.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/1139639787.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/661894846.pdfIn PDF document text
    • https://mszukam.pl/dat//file/ravowoxazegidaja.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gonulewuruvirapidib.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/34883146752.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/92197837977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=intel+5+series+3400+chipset+driver+downloadPDF 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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 11220 bytes
SHA-256: 41c5b919b0b5a544cf09aa7aa670d66cc4e71bd561f7e04750a4434f303fb91f
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 17012 bytes
SHA-256: 8e5cfe88f64b558a2f23e498db38887713462015ad8a87452c74ba15087c4995
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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