Malicious PDF — malware analysis report

Static analysis result for SHA-256 156112f8cf8b4be1…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 01:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ec9d7f13b4ba978a7f6360f6f6ccd3f SHA-1: e3c064b3569ca1a5e9c6fea97254a463318b4c9b SHA-256: 156112f8cf8b4be17e4d23a40cd149e50babec942f86a4d0ff6eda4f07d81a9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7dh6g69pdis1skpbnj0i0e1bcm/23381804890.pdf In PDF document text
    • http://friulanapanini.com/images/file/lobafi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615338c7828a4---91713951148.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/97334581857.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/lisazijubugaputam.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/vewutobi.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/98435195688.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/85700363591.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/bovimifuditonewes.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/sadovavapemojesegijari.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6baf8161d62732a017f0b0dd2c755909/9398985059.pdfIn PDF document text
    • http://snsi.jp/image/news_file/tufuduxisuviroraki.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/76866268133.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/96925444299.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/rawejipujumekuvowonuxev.pdfIn PDF document text
    • http://bamila.vn/luutru/files/7904861442.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/werigekukoxejilaterepe.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/93676923415.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/65941716460.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/91904954248.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/47790033987.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/vuruvamunibebejusekit.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/48767514348.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/karukixesono.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/fufumasanena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apk+instagram+latest+versionPDF 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_off0000b172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 16740 bytes
SHA-256: 3115aeaa7c6d83c6b50185b620381b17ff211d403d81bc4445e21e10fb31c9d0
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 10732 bytes
SHA-256: 25aa10f99858f4de56bf191e251e697a4b7ab8f9f5e3ce4fc36de3f5180c5ca8

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