Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8172e45a20e1394…

MALICIOUS

PDF

84.3 KB Created: 2021-08-17 17:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7bc9d1d3a70b20dbfa41ce9acaa47e4c SHA-1: 02b8fa3bf30e16597269a0b17b6d302b7d850320 SHA-256: b8172e45a20e1394c52f5cc7641396f6ebb5a72edd2b69d93b2ad996a148a161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple external URIs and the detection of a link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608971c6edd01---60924918174.pdf In PDF document text
    • http://kor-ra.ru/UserFiles/file/fokotajan.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/49553833436.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/94220765523.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac94474fad---71231660083.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a656280798d6148632b2076d78afa509/29158602275.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f311d13c6d---gobevotibixolener.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/1a3eb1459d2b7641644a8f964904fd8e/10064888996.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/2n7hkandej72se44rc5q202f0a/zaruronojinused.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/475365c5e10dd4ce213319f9c158c218/52574379008.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/xazitukopoxadubadovub.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f8f4b70f8---88874239464.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ddbf416d45bc9fd916570a63c663eefd/82216650990.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vegotaj.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/wonuvitijukavatufaj.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xilezonufojulagi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/u886frhflgkg2vd4d1geb7n4o4/30229557742.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/3532957414.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3dbddc5e17924e924c2a27914eb4fe97/4002900247.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/58838268796.pdfIn PDF document text
    • http://alkanboya.com/files/file///85395978771.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/389c263f0a6a71ea1ab94e8fcb93655e/larufevuzenosetedaxabu.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f019a0c28f1---dodizarewugaluwip.pdfIn PDF document text
    • https://777mto.com/contents//files/72777622963.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/wazadov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mapas+de+los+continentes+sin+nombres+para+imprimirPDF 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 10808 bytes
SHA-256: 96a80f0ddabaa2356552033fc9881c89865a61418cdf009e9fa8c12de1db4753
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 18092 bytes
SHA-256: c1c07774d88420f87593936eb50c3330e19a58cce0584a55d8ad9f8d559e25eb
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1