Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4a7c716f428073…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7db2e3a2f0eb9da47b4a5d6828e13325 SHA-1: e3abea1fa1ef51c73be08367256e345568592bfd SHA-256: 9d4a7c716f428073935e24f7c3a181836608f7c114f7ce3a30be23c5e8f048b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, including WordPress uploads, aiming to trick users into downloading a Windows 7 ISO. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

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 http://bangdientunhk.com/upload/files/50727965783.pdf In PDF document text
    • https://nabil-doukali.com/userfiles/file/lexopekamuzunul.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/77654957019.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/75207447728.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/109833b31389deda17ffa98af1568e42/mavepebajepirajeg.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/49190055533.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/12181231013.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e09ec982---12938887065.pdfIn PDF document text
    • https://primer-spb.ru/files/files/fusegimufudukosufagasuwil.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/kasazozapakemajixewe.pdfIn PDF document text
    • https://zzhqhi.com/d/files/89802440631.pdfIn PDF document text
    • https://badrivishal.com/media/74448866627.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/92288352122.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/69589655126.pdfIn PDF document text
    • http://napiarsaigh.com/images/xejulat.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041252199164.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/mekam.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1f5cbdb0---83372765599.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/78394106781.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/guloriwupuvebumez.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/bobinurusogizujufuretaf.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/mamokufapufevulufomed.pdfIn PDF document text
    • http://glassick.com/userfiles/file/14357447835.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/574sdl2b51vqhrc90bfjnu34k8/wuvofememekivakodofiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+windows+7+x64+ultimatePDF 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_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 10892 bytes
SHA-256: 4c52347968f2f86a490fb3c45d6609424995d51511e23719531819be5a700b6c
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 16704 bytes
SHA-256: 913d90380619f5a70de12306f80ea03e3252ef48bf6e6b92f5daaff3c8aa5759

Open this report in the interactive analyzer, or submit your own file for analysis.