Malicious PDF — malware analysis report

Static analysis result for SHA-256 f595d4987de93a76…

MALICIOUS

PDF

90.9 KB Created: 2021-08-06 21:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ba6f2b5250b9bf4ad5baeadc8e344e88 SHA-1: eaff31b98633200564530f28271905a6c59c0b2d SHA-256: f595d4987de93a76d1e192081da5a55b80ac30125ef42909098c184618de4c7c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of PDF URI and link farm heuristics points to a spearphishing attachment attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://dnepropress.net/files/file/wijufidaxipitupamuketewud.pdf In PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/simitedob.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/misijofavug.pdfIn PDF document text
    • https://coluer.ir/documents/file/bipusofa.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/25033046254.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/73238361065.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/98556c6dc0ce06074236fddf8d37cae9/rekanujotose.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b20caa2b9---lutiniruzinekub.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tulomazov.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096538cc8515---49319055748.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/42939153341.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d09144bc3---nuted.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/rozeberupenev.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/56265935161.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf641c1dd93---pokabuwisigopoxevesisid.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/dd450a2780563c1248e8dc3bd4c9dc06/fatunox.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c818d7807---32153191913.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/nidemuwek.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/zutofesixosugag.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4a6091ab712e254e105582844a967aef/46696058828.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16100ca5d0c797---7816951331.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a49598c8b2f91c0ae262785450511e9c/lozasif.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7258f30776678bf6978914dd215f331a/486204052.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/3743559160.pdfIn PDF document text
    • https://jagominum.com/contents//files/47643861077.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab1f52b3bb---gafedexizoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+big+is+the+box+for+a+65+inch+vizio+tvPDF 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_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 11316 bytes
SHA-256: 113a229366b04362cbc27e8c4096b9034b454c9cbd4eba1ed7096686532143e9
font_01_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 17956 bytes
SHA-256: b2c08492707145386fafec07861ef55ec2573953fde169c69a30f43e3cb21f1c
font_02_sfnt_off00014478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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