Malicious PDF — malware analysis report

Static analysis result for SHA-256 560a5042cc9cda00…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 20:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cd35b24a43f37907786b8782fa7292d SHA-1: 83bae9b952b50596eb65fa2b9465354d9af6ce26 SHA-256: 560a5042cc9cda00b145f6c918f7917b803df47733f364310ba3d1bd50922f86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://huntic.ru/uplcv?utm_term=generate+pdf+from+template+in+java PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o9i37mpibbq7vd3phhaqv0ji40/towipagorafodaba.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/juzoritinado.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/66524569140.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9hpqohp1j7hlku9t86k0h0qca1/kasenetovakapona.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2e34c1944---23921038387.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ecd0ca1e6---73302328191.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/lawibezesumokimekoboku.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gelokagonemaweju.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///sujozenowisirax.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/68619817033.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a23bd38c8---56659677873.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c65069e8007---jepesi.pdfIn PDF document text
    • https://ckmandarin.com/uploads/fuxif.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jr80pl67s4nqvtl5l855gbkb70/43446179458.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/josobeterazivotaja.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/63dkqorce3nkslknflt3gb0ek4/tofopefenedisomiwixax.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607841d4e5d4a---simejagixuwogorixisuxifid.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/wuridukisejatexobe.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7cae447---vidilubunozapad.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/fepovusaziwidudikoja.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9d2e34f89787272fea1caf280aad5fa2/26636905773.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/sexafivotoribupugiri.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/sujesalumevonoje.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_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 19176 bytes
SHA-256: 3270a48d88cb6afec390537d2a7bcbd8a95fbd869fcc7132f6f29e1f88efd271
font_01_sfnt_off000139a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A3 10724 bytes
SHA-256: 939311da0f6ee8b38b39fbaeac463e6e55dd172e983d4c51ccac79e94eef5e75
font_02_sfnt_off00015233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1