Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c89d356498d241…

MALICIOUS

PDF

84.1 KB Created: 2021-08-25 17:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2b30af5f661e251d759505a0173f1876 SHA-1: 1f424c8801d62d3e8de3203905dc950f3992aef1 SHA-256: 79c89d356498d241a1d2da2cf7a3dc7c95452472cd493ccc926a1d7da4bbf396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=maha+cet+cell+org PDF link annotation
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ple6ocm2kgtp521ouvhcmbk98c/garobikifibipa.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/81698304369.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/97733637021.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/86594a86e75f18d4b5ea5afa012364e5/14634937571.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d9d0622bb520e37dd2d6ed782ff2295d/sadibawovifiwadisidof.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e1cf06d46---mawix.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/36054778478.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/55839634849.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160796af406f70---15683364597.pdfIn PDF document text
    • https://ewt.cz/res/file/fepafero.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610385291b78a---wusidufinujumapifitut.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/kadapujadapagikara.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/pozajelurexeb.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210817_212700.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/04ca48a980335a4d84a77ad0acc9e7b8/8131901533.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a647c09071ec4b681e3598636c13c0e8/2248423179.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/zokubeforepivuto.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210605_AEC0C582D0B925CD.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/11119822542.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/57122957813.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/wopubamozelomilefazibemir.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/84ecaa500445ac2cc50ba4a1e1c395fc/dekuzetizoniduluw.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 19532 bytes
SHA-256: ecb5b8d73117f1bba2c0ab2948573805ae506c8d5c2e9ab8421a7505bcfe5c61
font_01_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 10140 bytes
SHA-256: 68deee41f87a06f736721b1d98579a3f1272eb197746ae916af06a4b0366d9ed

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