Malicious PDF — malware analysis report

Static analysis result for SHA-256 4498887621c4eee5…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 10:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8753b4dd06a0c6fffbecc15daf8f5ea4 SHA-1: 51f493581c04198c90c09451cf019f7ad52dd718 SHA-256: 4498887621c4eee58a676bba3377d161d1fe59f0d3519b8ec791477e315c60cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or other malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ecff7e799beb2a965d84eef8f44bc597/22444727998.pdf In PDF document text
    • http://asiadomainstore.com/userfiles/file/79935786492.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210603_061127.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080036cb6195---76924736852.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/67427501432.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/a78la0u8fuac4i0jkmh0601jde/34551790978.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072cacdab3---53488823263.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608384abf2438---farov.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608755c12f6b8---xenasun.pdfIn PDF document text
    • http://funperm.ru/content/file/lasapaminipevubovava.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/dotokekag.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d898636b9---revuwukutabe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a02eb3bbcd4---tikabojurudapiburusijotu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b7d6756a5---puvazupizaka.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/58203689266.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/jemarukugizidak.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ikk3333630akeeng4t9bppnf90/19351176243.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9534f343---liwewedijodibibewo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7d9cfd98---55631764557.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/50761094923.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/943ae6b2d8cc7e380917260dd6e3deee/lirutesalafegizukijaxegig.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/81602008147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+foul+linePDF 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_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 17636 bytes
SHA-256: ceab3dbbd15a8c164ec22bb3229bea7a79963aba6ad6643485fdd4e2cee346d8
font_01_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 9844 bytes
SHA-256: e043ba9cf6a195eca7fb41c15fad6a9468f83b70d7a74df7e0b7319b0c2e1ed3
font_02_sfnt_off000147c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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