Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13e0e0dc745b248…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 21:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3084c0db8cf00ee20e12a6b731dfdc7b SHA-1: 840d1a5cb0771145879d2ab59bfac5ea61ff2346 SHA-256: f13e0e0dc745b2481e6b0bf01f821e33c31504343d11c48ce9e0f0cfe617fe01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to other PDF files hosted on compromised WordPress sites. This behavior is indicative of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d01778243bcf132b667490fa9ac0171b/56677354191.pdf In PDF document text
    • http://clubselectionvoyages.net/images/file/86837962966.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109041729293107.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/86328292921.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/70445860588.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/b0pp49srigp705a3do4an3mfa4/99714358107.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xunip.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/81755278008.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/makov.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/vuwadewekirilefu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/28daf1286cce13fbfb764eaef87e7905/xuviwaxopuvajizopow.pdfIn PDF document text
    • https://betsin.org/userfiles/files/54754399172.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/tulerapolekadomemem.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8srko8lqgj1u9ljpa1viqmuh7t/27772927275.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/13087664119.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210914124624.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/govovuduxuk.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/rotaf.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tofalonomukemop.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210913005748.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/gosefafukogazu.pdfIn PDF document text
    • http://krupongs.com/images/file/boxaterasamarezu.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/15980119401.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/81479551551.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/sesuluwuroboxobarikode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sf+iv+ce+mod+apkPDF 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_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 10500 bytes
SHA-256: c488dcc4deeb8ffe0c601b8887332e1d50d199639ecd1060e8f8ef503655ed40
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 18376 bytes
SHA-256: 5f3b5dd95e8472e50ec5ffe4790563860b8dc077fa39b7c4b832fdd34aa19522
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1