Malicious PDF — malware analysis report

Static analysis result for SHA-256 31019b7d79903945…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 12:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0a838260abf37a9b4a3fb094c3db721 SHA-1: 489f96b5f9be260f3bad0f0a0f24500d56821bdf SHA-256: 31019b7d7990394504cd5fc382d8ce93b8293855b2aeb1af6fe714fca2b026b1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and numerous links are consistent with a spearphishing attachment used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://synerhu.ru/uplcv?utm_term=the+girlfriend+experience+season+1+episode+1 PDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8247a7f5c---zavebax.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_212605.pdfPDF link annotation
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353c9f62178---nemudejare.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/51870267145.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/lipapon.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/91920559995.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/41090317674.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonigogikefaxikekurelire.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613042bcd046d---feviwo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c315d7ee322aba16872c2c9e010915ea/vafuzunubijixa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e413b628c---gosatagibaserorugefefoxe.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/30936323121.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/nevadowojusowonakoxana.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/dibesunamugafuguzipimir.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/rivijaluxirogenes.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/634a835b1e77d5a465e00c79fed028e2/pezopabawarot.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/pexolomebunuw.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/buxop.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/14063527186.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/84025215924.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1a5c8f0b.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905031915.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/gabobodavumefunelajin.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 10916 bytes
SHA-256: bdc4ae7a62ad9fa4020c0a1fa32bc4c4c56249c7175a45a91dd2106955f946fe
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 18612 bytes
SHA-256: e5e43dcb6a80c6e9fbe781350acc09e8608ecb0e4ed0450028a0d8a95484c930
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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