Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fa5b35939116d9…

MALICIOUS

PDF

71.8 KB Created: 2021-09-10 19:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a30f7852d22971dc495fd3ade2e2cdae SHA-1: 5abc9a902b41adc9e2576aafc7534e0680462167 SHA-256: 42fa5b35939116d91e1faf194834758e0c58ad8f4d329129ae4caca0afb23ca5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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://royal-art.pl/uploads/userfiles/files/35311032223.pdf
    • https://wspaperbag.com/userfiles/file/24088948314.pdf
    • http://refinerlink.com/userfiles/file/mukomenowi.pdf
    • http://kunjipsc.com/uploads/files/ranazefakedasa.pdf
    • http://studiogaleazzo.eu/userfiles/files/vafuzawefixolagumuvuluxu.pdf
    • http://songdolandmarkcity.com/userfiles/file/12294729070.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/sixopipidared.pdf
    • http://qunjl.com/userfiles/files/volixeno.pdf
    • http://packamate.com/userfiles/7059533101.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/52258472012.pdf
    • https://zegaoyun.com/calisma2/files/uploads/40869712007.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ad82fabc---10643202318.pdf
    • https://bostaninsaat.com/image/files/dufuzuvugivotegisilugi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161325bbfc4738---51513757604.pdf
    • http://iact2001.com/userData/board/file/jurowigelo.pdf
    • http://fruitsad.pl/images/file/podozibegu.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4360849832.pdf
    • http://timavoshipsupply.it/userfiles/file/91772751610.pdf
    • http://0575zl.com/userfiles/file/93915845838.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/56300477263.pdf
    • http://arcstema.com/userfiles/files/fupobupixumetemasenabu.pdf
    • http://arabstina.com/ckfinder/userfiles/files/47498041877.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/soraxoxa.pdf
    • https://ceccardolj.ro/userfiles/file/tivesuwovusitikazes.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc8210572---46081486169.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=naruto+shippuden+ep+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b66f.bin
50151f2c08e07f0e37b06157ef9e9c3f9308a411fd5ce56125059d422e815b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 17012 bytes
font_01_sfnt_off0000e1c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 16792 bytes
font_02_sfnt_off0000f9dc.bin
c7d0b53db95f696a018fb8b78c7520db770f9a8475219df461403e0d23b7ba05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 10640 bytes

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