Malicious PDF — malware analysis report

Static analysis result for SHA-256 466443a497889c57…

MALICIOUS

PDF

281.2 KB Created: 2021-06-29 11:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f3da0fef332645bcf6ea86f6cf348fd SHA-1: 121a02b25387a1e85d297273a09c263e69245d9b SHA-256: 466443a497889c5742140a01d0d13e796d6f6263d29686c6eff677d28b59e87e
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates the document likely lures users with a fake offer, such as free episodes, to click a link. This link points to a compromised WordPress site, suggesting the PDF is used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9230

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://rainbowfurnitures.com/files/files/6967367939.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7662ac5f58---fuwejexaxasobefosadinex.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nioro0bn7n1as4rnefrjh8km6r/nupitazuketo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddbd84a6c---16154341816.pdfIn PDF document text
    • http://cwesp.biz/upload/file/96338092334.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c00cad8f6fe94c86e217bcaba4f57cf7/18213410169.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/pijodiginegenafasutuxivo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8c721b234d51d99be47ee9a4d64395a6/sizoleselunekujumisiv.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/14e6f042a46c699917ac368a9217f3bd/nexuk.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/529501e8c20187ce0b2665b3a7b456a8/dabikenel.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/75953327955.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/43160646795.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f7189668---juxufejapulojifanuxitusu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3669191dd---14040036830.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/42296079.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-1/20210501110356370129.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fb183f4e01bc4103ee967538536c73b5/farupomiwil.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5e63a50e---kegerebixebu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/20662316754.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/45834058338.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/wevolud.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/44226269661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=new+dubbed+episodes+of+one+piecePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B16 19876 bytes
SHA-256: 39ad9fe4d1fa0f31d1893ba19ae916d8ad15d41429ead0f5a3bd4600d4e34d61
font_01_sfnt_off00029d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B590 155980 bytes
SHA-256: 06d7fcbf896fc5c8127db51849ab2af5bd851521fd0298b0d6dc798cf387d60d
font_03_sfnt_off00043ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43EC6 10508 bytes
SHA-256: e86b324e1fdd4eab322021b59532b7ad488ce41ddf0680497d4d2b4c58ec6fd3

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