Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e956d6710cf935…

MALICIOUS

PDF

84.7 KB Created: 2021-10-08 12:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 98573250d833d61d1c4dc285ded5d513 SHA-1: 71090f821026b219c71ae791ca8878742b524f2e SHA-256: c5e956d6710cf935eec6f83d859de70c730cf476a735c253acb7f1bbdca358e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.kindspring.org/inc/ckfinder/userfiles/files/daluteroderuwizibawiwoz.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/32279329020.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/dowedusuvojosekisaka.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/26793988774.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/ponajufad.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/34934209332.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/vepevogoxojelelejek.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109042207559157.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/xurenibigudimuxolububiden.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161358ba26aa4f---bokofu.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/petotin.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/70564689922.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161362a6d717de---55664893143.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/vugidujezilokoxivo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615398ee20168---57624868537.pdfPDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b5d7dc06d29fda02e62d11fb2bfa9610/wopolexudode.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb21c535a---senopumaxed.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/66043042989.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631289749.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/bexepokotato.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/30498142630.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/tobogagosomafapon.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/gimejurinimudig.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/88921067767.pdfIn PDF document text
    • http://caythuocnam.org/images/files/kenolopebudinonaxab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+start+a+conclusion+in+a+lab+reportPDF 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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 19488 bytes
SHA-256: eac711124b9f6e7e8b573f03dfb912ca1cecdc40885b9b9500f5ef5ac382a927
font_02_sfnt_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 10684 bytes
SHA-256: e9905b24e3eae1d2e40495b428e71e2156048e6951542b3ca401463b4f884d06

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