Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80b34d853fa975f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 15:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5981250652f6c243ed1c4483c5bb0cb SHA-1: 19bb7f1786fe20e305cec8553e8007cbcee77251 SHA-256: d80b34d853fa975fc39b6a71bebcb407371f5bbd0b9b658ced4bfb32431b30e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents hosted on various websites. Several heuristics indicate that these links are non-clustered and hosted on disposable or potentially compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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 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 http://sieuthivatlieuhoanthien.com/upload/files/xededomezezadovimazojite.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/49219593132.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/zawazifozuz.pdfIn PDF document text
    • https://jobtiara.com/files/files/rovut.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/1606953800.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawuxafali.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/2553586994.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/86658050696.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/numenef.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdc284c60---wavom.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/34165351026.pdfIn PDF document text
    • http://proxima-design.cz/files/file/26410315969.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/fatabemexerefuzu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/fogirojibikebadulakik.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/pofoweloguvizida.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/gugiwikirerovupixoxig.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613801c74651b---xagisadamob.pdfIn PDF document text
    • https://birotex.rs/images/files/99175049073.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/39519089254.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/neforujaxufodivinezu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad7279e1d---57785699335.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/76096668767.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/45808680944.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d5c17bb4---gaxusolarerez.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9fd48b09b85e3358d9dcefffbc4abbe2/zejumovarigulokitozenati.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e06f98d2f36b8753d05cbef84efd0acb/safipujutetadibetor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=happymod+ios+14PDF link annotation
    • 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 20564 bytes
SHA-256: 7b8dfdb93fe25d72a1e625859611cb0c195654f9c24817a851966c2cc101d9af
font_02_sfnt_off00012a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A97 10308 bytes
SHA-256: f15367858fb2d2d801a94d87ae734522aa4384af0174bcf9586e55d90c86f013

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