Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb521cf08f63cfae…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 01:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 475df5c175c101979484fcee7fd3ca9e SHA-1: a28a6ef7408e547aaa17eef067cc96262be78ad3 SHA-256: bb521cf08f63cfae6aaa81285abada2f404f83311425ab54dd67bbbd419ef6f2
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various external domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it functions as a link farm. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=datenverbrauch+android+os PDF link annotation
    • https://makiriaszto.hu/ckfinder/userfiles/files/27653903727.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jilogome.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/lokizaxanoba.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/28654050736.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/25e6b7ca45252576d4632f425720793c/lotoxikazedipadelujaxefe.pdfIn PDF document text
    • http://live-net.it/file/39311638632.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/98772979565.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/2139185413.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/54678096610.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kapizav.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/karulezezas.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210912110935_1633990637.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/27010565050.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c63181609ec8efae8e1aa5ce41a02249/3759067771.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/noborekevagimixewe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef1d9960f---70965842045.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/rokirevepijeze.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210909110818.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/83959638905.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/kudude.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/65729808048.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vobomavemoleje.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/39469528275.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tbqcckijpb43ths8qfg2ftd6g2/nuxatanibogamogivup.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/65640716817.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_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 10728 bytes
SHA-256: a4fdd9557216eb4c3eefca4c161a740c4c805f3f66ff10425621a07268bb058d
font_01_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 20440 bytes
SHA-256: fb500c2afda48711486e0e4019c0ecd12461dacc1fa7904fd646c012a035c8db