Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f25ec9eb9763a4…

MALICIOUS

PDF

78.6 KB Created: 2021-05-06 10:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5d04eeda501141c785cec70ed15f59f2 SHA-1: 96fd9b66450244db52a7ea4548c569d7fb16a784 SHA-256: 68f25ec9eb9763a4f20f95fdedaf8447487dcea7b6b63665b8ee13afd85cc6a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'Averages worksheet year 6'. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware delivery campaign.

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 http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082e232dc9a5---kisutomolijijifo.pdf In PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6afdb6a35edb220ccc6fecb988c5e88d/38177661075.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd7b8c149---45288822093.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0fded530a15516e538065e429447e3f6/kidiz.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/o8t0scms48dvo0akcjessljh1h/sonisavezajuxijamoroxatu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/be29e5419508e4c5789f41a3013e75a2/pojegawowakemev.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea2919516---76389911723.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ef39420d5ffef90876641d366b6cd990/ganuvexijigolanolapar.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o621r5ub1ljq5adjp6b8l3f5da/katomojunenopevesil.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072921c5d998---tokuvagavisexesejifubu.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b518573bbcd31a06d6111ff25d2154f6/kogofidezitim.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbced477f2---10310469706.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/mujabifatatej.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b54737cb8bc860bbca97b2e58fa1b037/motarodufizabeg.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gonipimamupadakowoti.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d12f52b1e---medugod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=averages+worksheet+year+6PDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 5012 bytes
SHA-256: 505cdce593924a098633c9e2d3e01720e69be5d3169f32a6f24eac66c373c3d2
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 11256 bytes
SHA-256: 4dcbf8758c4dc04cd12bd731664bf076c09787a072b305e9f11313748d1ff20d
font_02_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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