Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b136d3ae67df34…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 10:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38873ba9d9d3e36ceb3659e5c4214966 SHA-1: 891256d7aae6cc68b79d31e592aedb06b98d04e1 SHA-256: 95b136d3ae67df3451e1a7e58d5eb1c6fcfba99e7b3b93a9617f9cb58a6a000f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URIs and link farm heuristics indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=mostly+ghostly+1+full+movie+free+online PDF link annotation
    • http://askaudit.ru/price/gawawame.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef61ea76cb---fojopojivarofofoputi.pdfIn PDF document text
    • http://ned.ru/uploads/files/zelepabewekute.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/wizup.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/pipunejok.pdfIn PDF document text
    • http://protezas.lt/i/File/tobogibenupebexejazik.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee246c12bd---gexukunojolavebive.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ketalide.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c9f6bc022338c9c7c895cad6585d3253/rumasidemukamomiwiruze.pdfIn PDF document text
    • https://riwg.in/userfiles/file/roberowedemoki.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/xosamuled.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/30777163111.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/litobis.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/21611282092.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/fojubasagavutavewodi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/24069535833.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/motiguleveg.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/49115892201.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/57857366187.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/44842412055.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89280267875.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/vizejaradaxoxidatuzomoxa.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/22355386063.pdfIn PDF document text
    • http://japhina.com/upload/file/zajolukoligefedimuravet.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/74603174235.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_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 10824 bytes
SHA-256: 64e595586d1b2bc15096872d6460d5accb09b5f13de9b1f301758662b6026539
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 17076 bytes
SHA-256: 8aac2ba4b4ab82197bba25f45076364a9fad6738e8644f9928d817dbdc10147c

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