Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9bd33f4e5a21b8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 11:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8fee46b9d1fee7aa5cd87bfe2e479aa0 SHA-1: e7eac59aa38a1ade94ad39cd7211dd8cc063d6c0 SHA-256: 3e9bd33f4e5a21b87b100097adde4277a1b2f7c77783c04fd5f579d71d310e21
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the true malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing or the delivery of a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=tolerancias+geometricas+gd%26t+pdf PDF link annotation
    • https://didacostruzioni.it/userfiles/file/moveropugur.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff462f80d---49833165309.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/vipipusevolutet.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/c69n28m8ll2cdsqiaoa3otagij/86087920550.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rafojowirige.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/7499750960.pdfIn PDF document text
    • https://ebooksweb.net/files/file/58362700497.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/992583b051a9db219b84b2601f688c7b/xaduwaxexopukilo.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/85916187274.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a580a901801---dafewav.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/bofebawuxamadepakuwal.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/biwukuzozu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/surafupoti.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dce22c3e6e---razafipobojatif.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/92723011978.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/wukuj.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079654d71887---44246717961.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d4b3cc29382ac919eeadcb64bfdf98f4/68883392014.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/6445159957.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/mazurulotivuk.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f85d883d14c5cf38e518aab53c8279c7/rutuzelodi.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c97bf07659297f24a6187356653ec112/nomuzekasogukoxi.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_off0000b8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AC 16404 bytes
SHA-256: 877776c17cc3b2ecf18414ef98dd22598a2126b751a9ac4b2f3dce10d3ccb8c2
font_01_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10676 bytes
SHA-256: ae747b9baf75916457455d0fdce89d5cddbb1fa6882d16d1a12912384b23829a

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