Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af1e90a94525723…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 02:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f46d9be42e2ecd1f069fd71aa88ef89 SHA-1: bf78553b47964dabdaa87b4317b07221087f8c42 SHA-256: 1af1e90a945257231b377c5a5defeb6fbc67d7975ec2cac95a1eea0fc82d49f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting, suggesting an attempt to lure users to malicious destinations. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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 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://crysiq.ru/uplcv?utm_term=medidas+de+pulgadas+a+milimetros+pdf PDF link annotation
    • http://www.css-jp.com/upfile/files/2021/07/21/50220179862.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/punuvita.pdfIn PDF document text
    • http://kesifveotesi.com/files/79501990109.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a329074f81---sisajotoxa.pdfIn PDF document text
    • http://ropesadventure.com/d/files/rusebibinujilan.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/90967421774.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/mebokusojupevupetajapoba.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/mazilikoditinefibez.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/54724b82560721c6de60f4bc0bfe6752/zukerowenubamonaxetimarax.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39ba34d30---wobefirezikezisamazavap.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/81800442571.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d53015572d---mimolabowaguxoxawobezareg.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021042908323673499.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/94670297866.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072f7fd53bb6---8742127397.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dd11fb7ee4bf1438c9b37e422c377694/1249514445.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/zifekanoninuralel.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d9128c67d59---83724712769.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/kegamer.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/dagorugotuf.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/92453068329.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3518d27626---95068153358.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_off0000b66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 15972 bytes
SHA-256: d65a684b35e3c6167a54ad9ffe32a471b2411ac9a2aab2c575d3dbb1c3d74e4a
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 10828 bytes
SHA-256: 833557dbfcfdcf4f9e96a11f3e4e889a3f23eb5277b46fbeea021e0c59cf400e

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