Malicious PDF — malware analysis report

Static analysis result for SHA-256 577c493111e445c5…

MALICIOUS

PDF

85.0 KB Created: 2021-08-28 16:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: feed082e41867e52d6e548883a88f094 SHA-1: bd023d80dd97f40ff5cfa0d324a787e72facaa65 SHA-256: 577c493111e445c53b775398e86c6a915b8ce9fea5f72541de4c7af261a5c4c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains a large number of embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The primary function seems to be acting as a link farm to distribute malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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 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://allytemp.ru/uplcv?utm_term=ressources+humaine+film PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8e1a7332e8f68c9d56e2150159ebdf65/72027685628.pdfIn PDF document text
    • https://tivicom.vn/upload/files/20819275637.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/vatodikiruwofawiva.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609110c9a4df7---wofadolovoparumurid.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/bowenosapusadagoturadiji.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/mekomekekutolo.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/93508934797.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d343a680f25---nupebukobe.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/21330110112.pdfIn PDF document text
    • http://gewald.ru/content/Files/mefuvegedibogox.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6jsiusinji3i70iruc70mrcj4/kemipixiximesegiz.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7838d43bd0fcc0b3a539723cf70cbe25/61037144245.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/jejofasolivimexikimawomav.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/98537969048.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/mujujesadufamokuvexes.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85899bed6a---zedekikizixepiximugebokuv.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/1669383803.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3495a0ce6---46891048464.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/fuxubud.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd3168d3ec---potadewej.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/44775730896.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/aho54uguigv82dh6dhm1vtpro1/buwexenizidaruz.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/19384365824.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_off0000e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 19728 bytes
SHA-256: ddbc1dcb15fc00f1c6cb60eb46020f6caac61cfd8f5d950f3b2fe536bc14a45c
font_01_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 10648 bytes
SHA-256: 6da90ac20a357d32771e817351e5b055d1b7e8ddcfcc6008df7fcb860ab3ac19
font_02_sfnt_off00012c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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