Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8e5a10fb64869c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 18:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9aed2ab9f02593f3c32bcd09b0b5572c SHA-1: 993390312e36c0eadaccd254a76888aa890436be SHA-256: ed8e5a10fb64869ce0d1e822e8e9ff93b85f10dfca6f08d2c5e5f6aa7b3c83ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points to a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=names+and+formulas+of+binary+ionic+compounds+worksheet PDF link annotation
    • http://nct-vn.com/userfiles/file/sowolamebovuvogesuxoleta.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73ece172c9---26987925101.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caaf4d9b6f6---kabazimemiwapori.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/dudivotunivelegogajefar.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/popafis.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/doparugubexexejuzefab.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090032219ad4---punafupafelasewilo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aff06355974---zitixisipugilefele.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/64257923576.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/dibitoko.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/fojabifagunewot.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/56628463655.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dfb86f70d---zelibexexelezusik.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/41668127730.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/99588698667.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/18582082946.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9b96bccf1393fd91ce57c0ff597a54d7/gisolixefuk.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b19263e7651b4e5b03527e124d20c705/dajurulixawuke.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/wolawavug.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070be55f12e9---56947499025.pdfIn PDF document text
    • https://terracell.pt/images/file/gumulolozuweje.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/46562568911.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/37382936667.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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 17608 bytes
SHA-256: bb688379d6b0aa4485d63ecc80f684c733b753aee4756e09c45014b40344c369
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 11392 bytes
SHA-256: e1b869153d4019295f9f03f1a7576f9b83fd7fff604d415b9db7d47e8e8a4815

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