Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad6cba954a6c66b…

MALICIOUS

PDF

90.0 KB Created: 2021-06-21 20:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3a2a59c5a28fc1ccc9967bae8f6a4790 SHA-1: 9e5dc263c2d4ace752d9a3a6437512143dbd7840 SHA-256: aad6cba954a6c66bd36bc65785cd9101976bfbbffa35dfa7f39e1cfc1305e80d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'fishing' in one of the extracted URLs suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pioneerlift.com/upfiles/editor/files/lezarosemowuvivamesenu.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/juvatisuvoworu.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ggnmtbmk1njj6s5ekd0ab0hi2n/78318570895.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607217afce178---98734149451.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b34f1253---gajegopozetitaged.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b41c096e---kupibe.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05db23eb9---68888888704.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaaa0e0ac1---doravepotewinawa.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4cjs9op52r4ulb5oer7fjousaa/lativogidopamifovok.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7dd3c1c6c0bd69635c349e58a20e8432/55273184558.pdfIn PDF document text
    • http://whatdwellswithin.com/file/83474591254.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7134929715---43627802891.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bc9ada94---6334992863.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/biwajonodinone.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8f2f34777b75de22f3d705a02d785f56/toxikafojoredo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fishing+clash+codes+october+2020PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 3036 bytes
SHA-256: 4cdb483b22f01e87cc6e80a935c9f726fa3332fd663b8b3f3a8b90f5ae6367bc
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 5568 bytes
SHA-256: 1f9c6d3bf400c0d26b4913c588e49a81fca36e29d0c12cbf4f9bf2d518a5fb36
font_02_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 4540 bytes
SHA-256: 1ca3959f0aa238b74d078f60e109337f504bb072664281f5a7abac0ade0f404b
font_03_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16376 bytes
SHA-256: 6a0d89e7912c746c431451c946b2545f4f82eee3b226f0bf1164e1e2ef10672e
font_04_sfnt_off000142a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A1 16108 bytes
SHA-256: f2cdb932ee13b796740eb614e233a545327b697588f9e663f06ef4c88113e31b

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