Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a564c99ac2b55a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 10:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d58fe41397565d8ab48fca0f1ec37699 SHA-1: 2a22a6779e9f1d6bc0854ca864208f12dc6a2541 SHA-256: a7a564c99ac2b55a50d6699b00832e26ba15e46ed9e1feb4eca041469f8f453e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161255ce060d87---disugaxigugosinimazub.pdf In PDF document text
    • https://rmp-familienanzeigen.de/cms/files/7221317381.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/dotupibule.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • http://parisplaza.net/clients/3/35/3561a7ce45da2f2f114a98ea6175a4b1/File/47068896994.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/wofodowirazuwiforega.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fce16084775---51893123503.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/71312517928.pdfIn PDF document text
    • http://demkapi.com/resimler/files/fogagijefig.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/wubotarivifidifufexu.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/pevafowoveborigekez.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/2818480582.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/52213770189.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ece67a1d6---ragonozeruvaf.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3v7o4073eq7kq153cugafadrjo/zebewavejedom.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/waliduvas.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aedc182dfd---buwufoxazilesetasixi.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/31861024358.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f0211b3fda2---xazororejidupexuru.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/45333982671.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1e2a8549---xadebibun.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/321e7073e032aeb7d5a7c94d6110a436/joduwonevatoxedikazitu.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1178c24b---nesenidikofulikukakobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gran+diccionario+larousse+ingles+espa%C3%B1ol+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_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 11044 bytes
SHA-256: bcee84634d8d246d8e428496f9836209707c0a598e499a8ce6fd69179acb9054
font_02_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 18620 bytes
SHA-256: 3d6129d1800f267fe996174b0668052b0add74da3308805b29a56cf683c37f24

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