Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e123bf30475000…

MALICIOUS

PDF

88.3 KB Created: 2021-09-05 22:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7178a3399254ddeef6a3253f74027d8 SHA-1: e031cb3e5e97a78f9122133f8de03e69c744446b SHA-256: 41e123bf30475000334be34015af1a7445d5ab319b2bbcb71ce61270717cea73
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm, likely designed to lure users to malicious sites for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=solving+systems+of+equations+by+substitution+activity+pdf PDF link annotation
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/28bcc585e371cddf6229f909c8476373/93546703846.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a0f292af5---pozomozixinofox.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e063b330cc---76891616120.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/42232728200.pdfIn PDF document text
    • http://denledmpe.com/upload/files/zogetenofula.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b637473b4f6---divexefugesosizupid.pdfIn PDF document text
    • http://hevolta.com/upload/file/8626540570.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/23956296663.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xiraluwujijol.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9345c1ec---fawunidig.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/96754292204.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/puvureraxiwuxap.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b439740d91d---repiwuxufalupomev.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/42862650443.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/dudebivun.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24e8513270f376e1aee19658830ba305/surebowukaniluzi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b8449d0cd277dea5b8457a85ea63e3b7/winuvotasib.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/kupupipovexuravalobekak.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ac0520af9f699b2e3ebddd28e9e0e67a/lobunakuwara.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/16760004411.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6d9d3f775---65338073687.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/wovoguxuwubiwidu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763d66b419f---25151590615.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/wadapofaki.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_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 11504 bytes
SHA-256: 5512a63b09c2a36c1dd8a87b7da9156b9fdbe84df159da48e77b63fafab22739
font_02_sfnt_off00012601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12601 17504 bytes
SHA-256: a894129a26cf17e51b17820785594f321d1b9ff5f303ed970e20af30d3eade10

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