Malicious PDF — malware analysis report

Static analysis result for SHA-256 377e34123fd3b388…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 02:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94fc5fd19ed59f664d4ab2e13c9f3932 SHA-1: 1f2d6f31ea6566f599d1fd0549731f75326ed0bb SHA-256: 377e34123fd3b388940f62700863401bf8d19fc7466b4a38e2e4e95550d237c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=bluefish+editor+tutorial+pdf PDF link annotation
    • https://digireg.dk/upload/97644916301.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/nonakobidonosoranatu.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/poraganofuxabafov.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/wewexi.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/93013575977.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/21102186266.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210707_A6A308D47126926F.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/68690084830.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb42c5783---nebazuxogalewajison.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1fd41bb9---diwuwelorewenabefade.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/92835766101.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/65079007fc4f59655a903b2e6dcd990c/pesusuj.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d77dc63cf---buzegosurezafuzo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430075543838375.pdfIn PDF document text
    • https://artenika.pl/fck/file/zifeminesezirasigefo.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/42618930997.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kot9g08a3er42ui8klo5b90htg/4296865171.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/gevefekezopova.pdfIn PDF document text
    • http://byecook.com/ckupload/files/tutunawajum.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd347e2f1---zapolu.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/kunitileradizujekivixon.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/55271486286.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/91126791024.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/11300075868.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_off0000d848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 18512 bytes
SHA-256: 24473d68ea4802ea72f5a4f2917396ba9d9388f3e4401af0cfbecfe0317c7954
font_02_sfnt_off0001207b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 10644 bytes
SHA-256: 30fb0fbb582a71824297ee67fe8928906f5b41db333fae9ed25dc2ec7aad084d

Open this report in the interactive analyzer, or submit your own file for analysis.