Malicious PDF — malware analysis report

Static analysis result for SHA-256 983336cf93f1e8c8…

MALICIOUS

PDF

70.8 KB Created: 2021-06-23 21:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a1a851d084c7036bf9f121a91b8f7174 SHA-1: 1746e1a0d1656cf07ae0f04bfbf57df8cea2e2a2 SHA-256: 983336cf93f1e8c841146b7e0c4145571c5373b1ea8d7a8c4f0a0c0c887ee288
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm characteristics indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pmfegypt.com/userfiles/files/zuxiputajegu.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2c4048ba---87111280250.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3tlm7s33gsikhvvjbpq9nseqf/68164893407.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073a36a7a007---mumelovibatepebukevuxi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ihaosjpl6oacsajdfq04ec68sn/27715970249.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/famukidow.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/liroj.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062c4169d8---suwifowipeme.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e74569677---velepozebawiwagok.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb460576f3---95995524970.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/14568804278.pdfIn PDF document text
    • http://mousike.it/img_ins/files/donutabozobogoxaw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52c181553---xupob.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/midewurunirixu.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/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pdfreader+itextsharp+c%2523PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/50445bf75de0a154e54f090fb6aec104/29075157399.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF58 5280 bytes
SHA-256: 9a5f8bb116aa63853e4dfc88e41bf2a69476ea1c88af50a821aec4d70c47e0c9
font_01_sfnt_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 12052 bytes
SHA-256: 63cb2115e6c635e6066e4169885917d20fd4bd123755bfafbfb4d819c9965a6e
font_02_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e