Malicious PDF — malware analysis report

Static analysis result for SHA-256 df66e3ad5704648a…

MALICIOUS

PDF

125.0 KB Created: 2021-07-07 12:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5654eb9575cb2d6d5a93e9a290cf0c11 SHA-1: ed0734b4dd2ca5cf4a38f1ee9f51929308982c8d SHA-256: df66e3ad5704648a62ca8067ee1bcda4d53242c4cbd9b56cf76fa01d07705405
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160856cc8c4bbb---56746937652.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/wobower.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609098b7c4395---posuwasinemoruwusemuzor.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076a136516---jadewapugoxeti.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/jogetikosabebuwa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6368944b178f6ae42dc6d99bd174f4c0/suxijexizopozufipu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae6df0f63---57937753236.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af885662dbd---11037181901.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/juragonuzoxekowonazele.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/nukitetuluxu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cae520d7ad9---fapavinelofevomezodivewa.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0ec3fa545a7a05cc104fb8b1a616f6d5/benerolaxi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615203203584.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/da5023c9f706e1ef4d5a113fcc1a0d6f/rukajixepevezofoja.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d78b3e8---2181177743.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9279e18bdf---xuluzurek.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/rewereluzakavab.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/22233800921.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3e6081ac---51146219526.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86619e3d---68715117059.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/40115366146.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608043213a1e0---5384249372.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/616891306f5e43084b3637df5e2ef05c/ropigi.pdfIn PDF document text
    • https://sy-tech.eu/file/mobizutizigajegesurutelev.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/79369167000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=no+greaseproof+paper+for+cookiesPDF 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_off000183c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C4 10476 bytes
SHA-256: 35fa73d3bf10ca002fdc03083c19c292b96b2fef1e73dd875bfd5b8de39fe76d
font_01_sfnt_off00019bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BB9 18660 bytes
SHA-256: dcbe707ffc5a98fa9f8817bb957c642771dd986ad219db0926fe357f7a767fef
font_02_sfnt_off0001cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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