Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1f14ea925967f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 20:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bd8db8eacb7951ced328ecb06d3e9bf SHA-1: a55f1805b376c40584fb6b919008ccbbb68e2988 SHA-256: cff1f14ea925967f0dcec610825b2e68db1af60ce322d97b4d8864e600075e16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The PDF contains numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of a malicious payload.

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://ahkjt.com/upfile/file/lurumijabadexovoze.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eaedf0f554cc986ec02fe0194bf60df8/pomajor.pdfIn PDF document text
    • https://manenshop.com/upload/files/nevezimexisubijatobeta.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/11068510011.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/98586933043.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kuwonojijewibupuwaximi.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/tajupibawab.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/7915382254.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608210c06cced---25923566307.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bokeraxulujonilok.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/27253013536.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cacc07b9b---dokemewugifelawin.pdfIn PDF document text
    • http://chinahongji.com/d/files/34379432579.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f8e93301---42593316225.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/p0kks05fm6jf66im7sbkd44h5u/livukotaxovotimumut.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/bukiwe.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d5998ebdaa064049eece37a8cc307b92/dafojuxuzunageke.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/dazenajapasogiwulewi.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/649a8abf7ec3bdd5da5c794d208db62b/97807459046.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/lepamubonilulisusuni.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210619210435_6pnyzn.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/27071978038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=complete+physics+for+cambridge+secondary+1+workbook+answers+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_off0000bc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 11584 bytes
SHA-256: ff2d70a713d4d36c9f8160de6149f64d22d395a49e5630c6c6f2f5b4df110ef5
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 17484 bytes
SHA-256: fc50fc3cb37bbc926a0afa34ec2c372942ae8948d01848dbad8f8c0d407216be

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