Malicious PDF — malware analysis report

Static analysis result for SHA-256 973f9bd0f2c699dd…

MALICIOUS

PDF

86.9 KB Created: 2021-07-19 00:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4faff746438508fe8e252aff6819ed5f SHA-1: b0ff87b2a666650440798d4705ea6971701d08c9 SHA-256: 973f9bd0f2c699dd593649430763b5b37bf5d4eaba0ca04fff2061e6f1298ae8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://broadviewlibrary.org/uploaded_bvlib/file/bisemebidovin.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h7i149tu3p9qdkcdml8g0f2330/denuvojumejisewudavoseged.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/watewusi.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe08aa9325---jimaxepuriruwimefinudapot.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ed8163781---94710630457.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/kilugepupejokarivibeno.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc01e32d60---43992477332.pdfIn PDF document text
    • https://tavio.ru/files/file/20474429398.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0941cead---gitagokifeb.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/43b1f229d5cdb25cd089aa8b6569e336/felokurasewa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/pevakujapewizeve.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00c0dd585---96598832760.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/dunevexiniw.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/43329669957.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/99476254666.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/8126603732.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/2626238562.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9a96n705b6njetgcci7emlhq92/27957754028.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c36616d96---sozifoxorak.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/20752179637.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1qih4j1rp6h9ui2f14m567i3e1/kemazadibixuwatimifidomu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906a51e511a---64635274394.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/75363937656.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91c3802ef---kokogedujiwopanejise.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/52078141693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cell+division+assignment+pdfPDF 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_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 10836 bytes
SHA-256: 73aa6bf1eeb06c728972bc9f11a4d8c5866e80283012745cbda80b9095dd8453
font_01_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 16392 bytes
SHA-256: b4adc17795b1e753835b70da4046511f33f025adab8653df94b1749dc4cb8db6

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