Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9e8fd515123ba2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79ec9df82f946357f66d0c16b8bba145 SHA-1: 155c92b9aa90cb93cd54f8917a1159102925752b SHA-256: db9e8fd515123ba20c9867d2b9c50dd23d029e793a8d4580ed9d92a4765a1d26
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to distribute malware. The presence of a visual download button further supports a phishing or malware-luring scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anaksemut.com/contents/files/benorusomof.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a329716f---ruledanoleneri.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/38cf26476d938081cadb65980a80ec71/14960317650.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/61427041130.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2931f8fea0990f9709376af323e3bb8a/vubonudaru.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/sadepeluriwekixu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/36253196063.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/mdp1rudibqukr7pql642n7sgu1/96077013732.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a577c91---77009149943.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/mezipuvaluwakolilux.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a112671a834723056932c58b24f008ca/49928458383.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/77511272389.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/j9tivr2dsmn05huj5fhenps71a/denuwiluwojuvutene.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/desapemibiropakolozej.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/sulax.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210703_224216_2571.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sn7qvostsq8dpv4k4mjeuc30d1/rumelunevitaridozezi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e11709a37---25504958040.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/suxovumifoxerobaze.pdfIn PDF document text
    • https://medpressa.ru/files/file/migeralel.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/35306642041.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/sinujabenagivuvevazo.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/86873925.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/31047840407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convertidor+de+pdf+a+word+descargar+gratisPDF 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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 10932 bytes
SHA-256: 229eef017a69672b9453a74d6ab20a1fc6ce519fec303946ac9a7043e02f2c45
font_02_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 17760 bytes
SHA-256: 537e9b8d015ac2dca7793ca9a091a582b58797a0031e047bb4cbfa6e1505aeb2

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