Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34827be5e33a73e…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 20:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52f8c837ccad7db7f01d1eb637ffe4d8 SHA-1: e624122c3fa06a9eab830b83def454173ccd26e9 SHA-256: b34827be5e33a73e756215cf409918c57b03a1c081286db98a273b1fd20d2b24
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to generate traffic or distribute content via a link farm. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cristalparkhotel.com/ckfinder/userfiles/files/62370746432.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614af179ca009---vomuvuzovifuxole.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/24346097571.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/14884822085.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/xeparusivuwaravixeguraga.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/2532289623.pdfIn PDF document text
    • https://bczenekar.hu/files/file/22301266035.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/43708684912.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/wivujanetezajovagopaset.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210910_AFA76FBBA8B8D657.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/81537393928.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/vabuboxodevuk.pdfIn PDF document text
    • http://rurisnet.org/images/file/xomog.pdfIn PDF document text
    • http://lse.hu/userfiles/file/64020701036.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/59501245339.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/19943579463.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tegaboki.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/devekiregujixoreborinu.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/58494001444.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ftjq45psn467sunm5v1d915rvg/54353663713.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/98545867260.pdfIn PDF document text
    • https://vpmemorial.net/images/file/rewukuxozelaxozuwozine.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161482bb5d14bb---88091429646.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/92217773341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=is+it+possible+to+run+ios+apps+on+androidPDF 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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 10576 bytes
SHA-256: 4e8e4a74c3463a7c88671ed96cf765eab797535701443a49334d86d89d5fda75
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 18260 bytes
SHA-256: abdb46a8c9ce6c5a6a78f3f93feff2be619b21889cc8b60606635f8dc29c392f
font_02_sfnt_off00013234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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