Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea0fd8e7426eb25…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 16:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 55b73471c442b4854a7a25616694b144 SHA-1: 559d8c9e065a404296941457bd105008d543c178 SHA-256: aea0fd8e7426eb2510d06a9d9aaf9d0799380e91e71b12c04b50a007ec97f954
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of ML_NYX_PDF_MALICIOUS and PDF_RANDOM_URL_LINK heuristics strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 https://crewmak.ru/uplcv?utm_term=prison+break+season+2+streaming PDF link annotation
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/86d1ee080d83d5d550e452bcaa97b133/34075662841.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcd75d61eb---42536154658.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/28744216864.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wugot.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f220abdb40---donujugemo.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/23618415180.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/61196585002.pdfIn PDF document text
    • http://albachiara.info/userfiles/files/degemaparuwokan.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614238c3a96fb---gekaranadiremekogig.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/34800592905.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/24641159867.pdfIn PDF document text
    • http://gibisch.biz/files/files/80417512897.pdfIn PDF document text
    • https://ysh.my/userfiles/file/92395112777.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lbjvgqadq6sqaf9drmvc8u2qnn/mijodarilani.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0657ee757---zenenibidudadekisoxowid.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3gq83tctu607alkst5or8a5090/4747291407.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/vejomesukimovuda.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/monolisupop.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210920094500_em9kZXZhbWU=.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/sisetaroxoxi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/80553836700.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/92871325178.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_off0000b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 10760 bytes
SHA-256: c66eb60a801beec97c06573025304665e2e827b430173db622a4514cc0c6b6ee
font_02_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 17040 bytes
SHA-256: 442e3f041c57b7c0b8d9b7e1046aa77f65cb52bc5be8c7ae59828051752d336d

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