Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba7787934e1480c…

MALICIOUS

PDF

85.9 KB Created: 2021-08-02 02:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 152bd1ef7a0f6830e368d248e640ef98 SHA-1: 4929d2ffcd8dab9708003da71484de096dde5549 SHA-256: 4ba7787934e1480caf4c37cda0d19aa032f7139a24194bc789a75a1ef0c2b3af
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7781

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7aqr5sh3aek37bn0ora3qdvjh4/nugulegidimegit.pdf In PDF document text
    • http://kvbm.org/pds/userfiles/files/lamivokixafuvizipumogunib.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16254391607508.pdfIn PDF document text
    • https://proxus.nl/file/kiwejepuzitunufur.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///rofeworabajotevikav.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/18294900928.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb93e06ccd---biboberirumabel.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0251b18d---vewupilowevuwizarukugisov.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/livunik.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jupasud.pdfIn PDF document text
    • https://preciseenergygroup.com/media/23250811654.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/52293763768.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/3242896696.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/56979179384.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1395743b5f---2101256867.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/arf46rvttj4ugd8p4pn49lmssf/38420001109.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/6d19a7eb9666de5e03acaf3c486d272e/fabanogepen.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4ec9978f---19671833876.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/99642305138.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/70953662935.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5352a0acd8d6153472217b4e47aa7a0b/26339716851.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jssm4ofv87l5ggoigv0iaaohbd/xepovibakojujalewagelega.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3va7089ksohh4vfgklr4fil6t5/45771462950.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lubopenudusazaje.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/342a446ac6d477e3d4bd7d284ffcf8e1/23016741606.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/31093940537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hand+lettering+practice+sheets+pdf+freePDF link annotation
    • 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_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 10768 bytes
SHA-256: b1ef8f17d41c9b68c5ced68d9c9370aa00773e5c0733c3c773069e109e41a241
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 17048 bytes
SHA-256: 78c591e46bcd2bf55332e0ce965372c455967160771f5c5f1a2687afebd554da

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