Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46b1ffcb3ab7ee0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 18:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d571b03285740e7a32242bfe316b56f SHA-1: 3fd11057f1c36b694ea9639406ec8d88611f3d48 SHA-256: c46b1ffcb3ab7ee0d465344b08942c53aa79f6ab6c1c3688ac44896a5627287b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The embedded JavaScript is a common technique for obfuscating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160833e3c80a4e---3197898686.pdf In PDF document text
    • http://pensjonatagat.pl/userfiles/file/83429901580.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/61803676919.pdfIn PDF document text
    • http://cloverdiamond.com/file/lejokuworefe.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/54637281496.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/15473413304.pdfIn PDF document text
    • http://primaneighbors.com/userimages/50363446298.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/50112875896.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2878aa997---kojofaj.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kezonetedas.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e78b46d2934---gigizolugagexidoki.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/widowuwimevulovaku.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/10635361557.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pokavoxode.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/83257103769.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bab98b2e---negabisid.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/difaj.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/vidapumelibetikexorev.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/99853004430.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/13533945478.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/7738842461.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81f62e5b4d89af4202caa62c3a7ddfa8/66926039565.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jinexexovivekopizejomineb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=business+plan+sales+forecast+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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 10764 bytes
SHA-256: 34c12588492a41c3e034062fd658d0930cf48fa663d98e4993653248f5cfb7af
font_02_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 18120 bytes
SHA-256: cc67ad5195e756149013e5dcd7727634c2800c26cc06bae2c2885f6be2889a79

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