Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18b5e79d3d09a98…

MALICIOUS

PDF

91.8 KB Created: 2021-10-08 02:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 591316fa503e73014dbd358f49c79343 SHA-1: 83b781b34f573806493c802afea6460084a91abd SHA-256: d18b5e79d3d09a98bf5d4082d279ab1fb3598ce5a69f5285baaf6a380a09c276
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://medvor.ru/uplcv?utm_term=one+piece+131+dubbed PDF link annotation
    • http://ourgans.org/userfiles/files/38650576570.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/20926452168.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/83575652381.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/27414d5d2292cf24f5e947f53b4df62f/vilarofag.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/velulotakelasido.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136909d6afbc---suluxonenini.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fafarerutobusi.pdfIn PDF document text
    • http://goref.ru/files/file/61323369895.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/80356407734.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b515787cc5---gaxavegivedodamuzoranemo.pdfIn PDF document text
    • https://tmtteks.com/files/4144390049.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/78691615490.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210916173221091.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/80542709422.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/omobawawuseb.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/lilikezuxixunowe.pdfIn PDF document text
    • https://logcabininn.me/nbloom/fckuploads/file/52434983402.pdfIn PDF document text
    • http://zaiger.ru/img/file/53415677581.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/61269420048.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/wobowesaj.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/p6gplf2djpfhlk7p27a72evhl5/89506949647.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_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 10300 bytes
SHA-256: a0a75c0a1185cc919a9960468f1266abdacdf31887fd7e35edc8a07f95462701
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 21592 bytes
SHA-256: 80a52048648dc374744b168895a680d32b03455259e81536bddcbe0a9275cd55