Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c03861cbe7587…

MALICIOUS

PDF

74.7 KB Created: 2021-08-28 10:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd27837d0c6ed4c86267c98d97ad8b31 SHA-1: 543e055796a8fa2380e10a75e4b93b722da23d9d SHA-256: 1a0c03861cbe75873cacc084b5be297d5e4fc3e8a06013b0084449c938fee22a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=download+free+nursery+rhymes+videos+for+mobile PDF link annotation
    • http://avstralianature.ru/ckfinder/userfiles/files/madosewilogovi.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/faxubawejinaveb.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/zesivelikilinuk.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1f6c857a87c541e3101dfc751af1752c/lozavowukizasiwu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/31691567408.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/jisomuberenadeloza.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/kusebokufosegekipitipek.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/56247247805.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbceebb53---4667742382.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/pirizukope.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/parukafidilez.pdfIn PDF document text
    • https://suksesunited.com/contents//files/14080099678.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/61350596310.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/gadojuja.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210710082423_zc28g4.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/29104143051.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c02682acf39926f616725a795df5a56b/fukaruxixejorejava.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jevuloditeziferojeve.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdfe1f164---boporubigu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ed4e583e1bd6e075bde3c8f67a4c31b0/83942380362.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fedb459567---99388420352.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qmjf0lr15q3no68bkbipoml7da/bolewipobowazazuliw.pdfIn PDF document text
    • https://esvigo.com/upload/files/patedijinopuxepo.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/wuramigikaxavuzagelo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf9c311d99---40730562902.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7238f195abe55f703228c4ee09e3a82c/83619007529.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_off0000c055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 16828 bytes
SHA-256: cf9750a017526055d93eb58abc3717b97ed43efec2e2e69a2d60817c759cb2ed
font_01_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 11028 bytes
SHA-256: 7495756a328b95b1b5660f9fbdc4a174175b5b3c4027183d1c2734d74dca2d5d

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