Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0092791429a8c5d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 04:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c5e1cc2eb931d147fa1889ec4155b4c SHA-1: 4093f863470c07e9d777f1baf68d4b90d3ef8ed3 SHA-256: e0092791429a8c5dc866e86170ccf0d04f4ed72505ad8ed285e046fb83b64c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=rem+live+wallpaper+android PDF link annotation
    • http://villacappuccina.com/userfiles/files/31143475473.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/31748577080.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0v41fal146t9taafjsf4gbhu2v/32640886753.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/498626ec9b93034152569595a9204723/jogixotu.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/26569591381.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/10/rotuseleduwa.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/74739403467.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d1qa1ee9raa459bj063dh1nsrq/nixoladelagidu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131f35d0b46d---18524348728.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/30377087349.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/53847193171.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/90418196975.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/68547350221.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/wusubelekoziwelibatodudi.pdfIn PDF document text
    • https://bak.vn/upload/files/mumoxetolakom.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/16232176108.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/bitaparawitos.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/lawojamero.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/mobuniwipitazuleminubib.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/41214734453.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/nuxurufuzun.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/kusoxabid.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/4741970108.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/fesiwotonosi.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_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 10484 bytes
SHA-256: bab70de1f2d29b60324a3e5f4c4f94ce19e764c4b4e23bc2bd274c1d259a1c7b
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 21204 bytes
SHA-256: 7a8bed4ab2560b2bec613c034f572bb703af33a87154474da3923db2c3b55d5e
font_02_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1