Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ae1839153c8fda…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 02:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1fabcc872d4b41039f478f968498b28 SHA-1: 35716e39e481132f9cbd205e56925f105c465a85 SHA-256: d7ae1839153c8fdaa78985d17c75be1f34f1cd330e4c503f308c31fc2f449c26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also features a link farm pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of embedded JavaScript and numerous external links indicates an attempt to redirect users or download additional malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vienhung.com/webroot/img/files/jokixasilulogibiso.pdf In PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/15657532439.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/litonakub.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/vonabaketu.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fafakokokagalewopevize.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/rolibarikesiduxowefuzup.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210904053505.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/98312999101.pdfIn PDF document text
    • http://licausi.it/userfiles/files/devaxoxosubisutojixaxom.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/vosaxivixotipajivun.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/96570761137.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/mefuw.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/75684019776.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/tuxig.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/84900092066.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/toxekomumoxu.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/39742705413.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/kivobelarut.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/23047499683.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1nhmdd0gaeo4mk4ih7drsttt1t/tadajitabasat.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8ad0d6d0aa433f8bbacd72a9fa54acd0/rutozanuxasowawofusovuxas.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/67804400720.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca320119c178590a14bfe7553f3c62eb/tukuzipoxixumilogazojavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+san+andreas+unblockedPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/66809295618.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/85479293978.pdfIn PDF document text
    • 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_off0000b465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB465 14868 bytes
SHA-256: 650345d0247aab7faa87b29803bba76217980ad5180b12282e93af2f3acb5305
font_01_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 10644 bytes
SHA-256: 970ab41ae0866e3feeea647ae150295b660263d4aa6155a346b76e0ec6218489

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