Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6a21d4f0b82be8…

MALICIOUS

PDF

81.4 KB Created: 2021-07-26 14:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1d5e4ecc0fd3daeab2e7c1cf6ba3af8c SHA-1: cd77f45bd255656f3fe523a7f1eef1060ddb15cc SHA-256: da6a21d4f0b82be8de02665194eaae9a1a4ad129303e3da1dc789ec5fea0fa60
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4he8sa819ttljv2hqcv01aaovd/fikadeb.pdf In PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dikekumadulufuwapuk.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/67026102093.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210627_A08A95778636192E.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gajupotaziga.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/vivijakifire.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609549413f833---85723231477.pdfIn PDF document text
    • http://homeopathyhk.com/files/piwemozofoxirinipuga.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/u2aabv1aaflrvlvbjb2gjf4a5f/19513084994.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/pijedamipugutitowokinemo.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/wajaxidijubowumota.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/jekepasakuvalileb.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3f619bpjqmr3mnh214bosq7c9t/31692339420.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/26403336266.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/jodiramati.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4833e630abf107e33b64fbf3b16f4780/xavemupifanumekijazikepo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7269298e0a228acf2921d8613dd7abd2/42681375877.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a3dffa3aca14cc5cff040f7e2f6d47df/befalega.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/94255710239.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/72044816173.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a133ba887e9---duwabegofiki.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/zazisaketidenu.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/digidewumutajel.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/19862527736.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3ae9b9b1a8bc7ea16a2aaaf77c322684/8019155197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hirayama+autoclave+service+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 10660 bytes
SHA-256: b533b8072a3acdcea0af11c239f267d9b1b8ba7822875816a31dadfc4c5b4d37
font_01_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 16192 bytes
SHA-256: 62a21edaadfc36c75327606764f9e04f8d6cc17fb851f592309b339eb16ba83e
font_02_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 1700 bytes
SHA-256: 22058adb6b7da9e80b353ebd533cd6f8bdb1faef3a36d227872135b1c1ab6f66
font_03_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46

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