Malicious PDF — malware analysis report

Static analysis result for SHA-256 b189724dd9e1f3c4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 09:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d8137d7724667d7b5fc02704265bd8d SHA-1: 7b72a2dec4e23c1552f54763e2d643b17817c3b2 SHA-256: b189724dd9e1f3c46c32fa0615fe0e05eb2f2966885b0462fc47af91c034fe7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to artificially boost search engine rankings or distribute malicious files via compromised upload functionalities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=fantastic+mr+fox+pdf+free+download PDF link annotation
    • http://elosc.com/upFile/file///ITX202109011857065456.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/wegaligezetenesiwolone.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b29d68cb---81779120739.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/28694236044.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141427de4c7d---13063077917.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4dfe3473---39763855625.pdfIn PDF document text
    • https://tcremich.lu/files/files/19013953337.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/bepetokudosakinasaru.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c102ccf30858fb10b1dacd9a39d4b94/lilijuvovafesifigutolago.pdfIn PDF document text
    • https://pisausakti.com/contents/files/11570749229.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/30300493362.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/10240973692.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/q2fkpdrkki7146julj0fosc3vl/50198362032.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/6803613261.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f565d771de---52839956967.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6b036aabc1f1ed8773c808caa33c30f3/25973601119.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/pomufirovamijopisujor.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gesafizalit.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/zulonadokewodawufegeje.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/27426304091.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/wikoto.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/4935096444.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161447182e65a4---sezififawowedubofopub.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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 17512 bytes
SHA-256: 1370bc592d496edb7de5f1e09136b43c8cb9a6d2f781a52d1865e7f136364401
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10944 bytes
SHA-256: 5736c29e89983f6813b9b863457cab09d0866949739ba64862f981970588ad86