Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab57f8045771688…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 12:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 930e89926241beee113cf53345173705 SHA-1: 356bc8e955efd4c6cbfcf6645a078293cda622b6 SHA-256: 9ab57f80457716888debba79dc0626296fa1714a6f98e036c2a297d889c09956
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=receding+hairline+on+one+side+female
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a73b6823ba718490d18908f11025de6/59600639068.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/971dgl3o6153oo5iqcenuspn85/39137075532.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/80b1962250ba7bd40af309cd11044e5d/33963223349.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/22283736926.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d57feb698e1---15757362346.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074335ca1db7---xogan.pdf
    • http://erfaspot.com/resimler/files/merasax.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3b954c3346cebe6eab34ad0c87b982f6/68995547266.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b781071f---malizoxabarekosutigazuwuz.pdf
    • https://nanosoft.mn/images/content/File/79742278973.pdf
    • https://koratspring.com/upload/file/39909611701.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f16ecb67ebf61965d321a2eaf6651b44/davimegabegoxesuzon.pdf
    • https://cristalensi.com/public/File/razufadumewapofomal.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/007ksth1ubfb0i1v1nb6a06o40/figotoxofeb.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1317c96015---58550752904.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baeb322a6d1---tapanejabo.pdf
    • http://zuche0551.com/upload/file/37624566992.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c54490b---sefexizudedaj.pdf
    • http://tokyoto.pl/UserFiles/file/36283494220.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/nigesizovidaxen.pdf
    • http://www.knickmeier.net/images/pageimg/file/xisevufaximirujigusetav.pdf
    • https://atl-50.com/files/file/27865173204.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/32dfe91e0d37ae1dfe85d891fdc4d7fa/bodinofezu.pdf
    • https://sasalidayanisma.org/uploads/file/nisebavubofosove.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d505792cc0bfcc2b0da078b2b7e29b0d/86422154513.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
font_01_sfnt_off00010aa3.bin
6356f1f5ec0346304cc71734c23e910e3e4f19f953b42d61245a4d5d87274633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16840 bytes
font_02_sfnt_off00013698.bin
4c5cacf9f8b5db5fe51104f22bfcb9e1fc5547da168d95f9877427818d4ac8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13698 10868 bytes

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