Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d1112d54f04966…

MALICIOUS

PDF

98.5 KB Created: 2021-09-02 12:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e276d16c2241605c563cd1fcbd96f7d SHA-1: 94e8b509d15412acfe31b8972a9c99db66dd4f44 SHA-256: f8d1112d54f04966c0c45b6e001314f8ba16df965b3125a833be8fe388e7b3ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The primary URL, https://inwebjor.ru/uplcv, likely serves as a lure for phishing or malware downloads. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D8%AC+pdf+%D8%B9%D8%B1%D8%A8%D9%8A+2015+%D9%83%D8%A7%D9%85%D9%84+%D9%85%D8%AC%D8%A7%D9%86%D8%A7+foxit+reader PDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f48d4c7c55---27588437737.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/fopuso.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/88031343048.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/kerede.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609561692514d---30154015884.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/66386592382.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d1b73c457264a44a4b9fb0bbb8e802d8/2095789659.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/muzaze.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079b724a3502---vafef.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n21fq5nf1bt7s6j2hb9rvdau8m/wufuropokanuv.pdfIn PDF document text
    • https://auto826.com/uploads/files/vemuvaz.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/nateras.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cac7ba1bff---67857038587.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54d4c6bd4---94968118396.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/77722737394.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/a47ljbl07e9ll5fn7p1sb7ao1h/genupelerimamemi.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/famaferu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2695f856---86589005671.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e48727887a938722973b2a52049fe4ed/90454126178.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/88956350f469ce3ed0707f6efc502227/xazaji.pdfIn PDF document text
    • http://myredm.ru/uploads/file/fakekokufawufusarogamub.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/risuled.pdfIn PDF document text
    • http://altinay-law.com/images/file/dumuxivika.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/fapikoseva.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/2541887311.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f9ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9AD 25724 bytes
SHA-256: 7374a592d0c862085532fed50968963184ddd1c56133ffc2deda2ab9b69d950a
font_00_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 10608 bytes
SHA-256: eebd77993effec4ba79b16c5fcbfaad6c26d138d512ddded56ba5f8f8b5dfdc2
font_02_sfnt_off0001265a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 20240 bytes
SHA-256: 3925acebe52fc98a6aad259a39cf39fcde91956bdeb1db4766d2a5b2970ccace
font_03_sfnt_off00015abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ABD 18596 bytes
SHA-256: e9fa0d97e73978a0ba91d95b02e3908418497990e0850de71c1b3656d149a7d6

Open this report in the interactive analyzer, or submit your own file for analysis.