Malicious PDF — malware analysis report

Static analysis result for SHA-256 7534ca5830b44ff3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 22:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 856342bfe7ff34129f70c6237e82a252 SHA-1: c27cccf12430fe618b50acb2fb8626d2f0c46e1e SHA-256: 7534ca5830b44ff313434ce63e9fe1ee76d8a661a812ffce60543a8cf55c905e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple link redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=toca+boca+world+mod+apk PDF link annotation
    • http://locthanhroyal.com/upload/files/86432480635.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/74172528908.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/95032580549.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/29438751522.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/vojaxuvukizobita.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/48767332052.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcfe807b6---fewazizumutega.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/93136342054.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/bodufajar.pdfIn PDF document text
    • http://krupongs.com/images/file/43581522435.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/lumomikozizumamo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/49718671964.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/wawixufuvesaxenuwatupuvo.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/gesavisoxumiwonokavoxu.pdfIn PDF document text
    • https://businesslife.com/content/files/70670758291.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a8594906b---folonetawovojabenedumolav.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fab791423---87974221204.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/sorivowapuneme.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/kelizefodup.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/rikobomupesu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/43655461004.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/getopejukitaketozopok.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/waresonixukidog.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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 10364 bytes
SHA-256: f97427ea23b11028ae76fee1a326eaae26f645af1685288b112450168242d4f9
font_01_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 18200 bytes
SHA-256: 6b1d20c772fc489f7a3591c400de1f1de2360d117cfafcc2dc005e83e14df5f2
font_02_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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