Malicious PDF — malware analysis report

Static analysis result for SHA-256 38224ba5bcd3d69d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 12:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f883462c453c88623d1c77c334247333 SHA-1: b31939040e0618a095bb600d5b8c2826859cb180 SHA-256: 38224ba5bcd3d69d3efd2e7c06f6bbafa89c0425662c40b80452d65ae27c1380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a65553f67---39622160472.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6d5a5abf---figeforuvabolotifediwu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/60993146250.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d2e9fe4dbdeea001705d0ce48ee70019/zasig.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/pijuxetotixamajitadewev.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/panuno.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090482128e12---38603315274.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bvcpto4nsa4bo46he4mc9qmlk4/zoximiruwedomusurozorab.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5aa17da0---28912363772.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/38184492432.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad92675843---52335571224.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a4452141daa304f0580b15a2f8382403/witar.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/23571787759.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/277161644c465d497cf90d410d5c446b/lusotezulumigosaranogi.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/godulusorurijinusupuz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942875727ba---kotagujusezesosadivisu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607580759d859---48933835558.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/susigagefojewopok.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/09c2e1889c39ba40e9cc6e2ea1a7b521/62564765109.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/32428621503.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7a388505g055qimadasdhl40l5/kusimuguxetasovavaz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c8b30b142---38797997812.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/66515519188.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/74749348111.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/sudamoxuviwazaped.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/nodesusaso.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/fajekapebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=brown+bear+brown+bear+what+do+you+see+text+pdfPDF 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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 18152 bytes
SHA-256: 409db7153c30b0c50e20db2695785a5d166c424c49feaa7451d57e32868276af
font_01_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001106b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 11052 bytes
SHA-256: 34a313d2bbd6b15fc4fc48b3301d561f91d54bcb28de2434fe49e7cd510ccd8a