Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa97b0e9053ffe3…

MALICIOUS

PDF

108.8 KB Created: 2021-09-06 08:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d81aa193990b6cd41a0d4bf5d38b2eb SHA-1: 524f88adc366d0e7cbdeb082bf52ff757dcd2ebc SHA-256: 8fa97b0e9053ffe37b209ef2346f2d13e57f5819926c3c3389cc5f495a281e39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://comp-art.ru/userfiles/file/levuvofafejotidibikazap.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/773f4b964f24dfe1ae5af0d596b1172e/77857193691.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/70602842122.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/11275437798.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/sag1tv9b5gnih35ddvfpble4lc/44120146250.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/43664609562.pdfIn PDF document text
    • https://binhvi.com/upload/files/tukoposekixefujuful.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/lavazuwimutepaji.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c23626269bd---gebafomisaniwujakela.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/temezozikerisuzizidigilaw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f308eaa8668---fusukudus.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/bixamovapen.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f23762f6---3111316946.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/h234v046v6p58b05qff6qjklt3/getanejukazisala.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/kurekumelaxidexinurejuji.pdfIn PDF document text
    • http://normel.org/files/upload/file/58346621188.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fewojug.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba9a52c846---wulutuvidosodidogida.pdfIn PDF document text
    • http://cochemical.com/upload/files/varotapivifevusupu.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/18878127092.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1899665ac509f16233a731af10b0c6b9/48599491822.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/zujovomezijesaxajome.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160739ee100eb0---58629604896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=machine+learning+algorithms+and+applications+pdfPDF 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_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 18412 bytes
SHA-256: 3334c2a1901a096b900dfdf5f346f758776b84279de5f9358643d6f9f0f9698c
font_01_sfnt_off000173a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A6 11060 bytes
SHA-256: f7eea00f5b2933d8b69dbba69b164c5234c4a3bdae1228f7750872dac7781385
font_02_sfnt_off00018d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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