Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b0b5160ceb1fdf…

MALICIOUS

PDF

85.5 KB Created: 2021-09-06 08:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e69cba8c8514e54d5fdb5272fa845465 SHA-1: 1336aafc1493e91f8ff60ad4d96db8f53d6b1cc7 SHA-256: 85b0b5160ceb1fdfd5791cc78adb0e4614645e5462adfa40e14a3e0654aaef62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious payloads. The document also features a link farm pointing to compromised websites, suggesting an attempt to distribute malware or phish for credentials under the guise of a study guide. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://elmaryapi.com/ckfinder/userfiles/files/jaxaxejinibub.pdf In PDF document text
    • https://bem-sa.com/img/file/31912793752.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/70877469770.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210820182530086132y6y4a.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/67a152a431424a2a604a6c7952c872d3/parosivezodudodajeninus.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ditim.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/gufabojadiveje.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_075920.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/148f8eedc42da54e25ac01d73ac634e7/soxepifizixuzosapabas.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/13288239911.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/zefur.pdfIn PDF document text
    • https://uangraja.com/contents/files/gopokozivo.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/4051266693.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/sazalaxagowinifabakapo.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/13116381379.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b6e736a43---jubesesutulut.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/xiligak.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ve1cj1c9tr32rt4c69a74e00a4/41400400414.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/sogelajiziw.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1cdced7b---86841903473.pdfIn PDF document text
    • http://firegallery.ru/img/upload/15458184480.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jvsi56uudt9kam7lfkm65j4snb/69499231185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=aws+certified+sysops+administrator+official+study+guide+pdfPDF 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_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 11244 bytes
SHA-256: 8370a436190241d031893a169c4587d7df25879c59e58852f1a73cc623081202
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 17980 bytes
SHA-256: d5f6caf6a4e176b893d1f2bf36260749c273996b2d1945200f5e7ead5307bf2b
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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