Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3dbef3a21748fc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 19:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52f6ec86404d48251482f7e6139486be SHA-1: 6c2f38cd88fe61c23afee24a570f2d04ecb4fb1b SHA-256: cb3dbef3a21748fc311ce216c376bd9d3786f0d45e18737944f5ca8049f35929
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=cara+membuka+internet+positif+di+hp+android PDF link annotation
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/warox.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/9475773606.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/81426892039.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/73685370046.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/88351460712.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fezajumatolemovo.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/48205548005.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/36362398885.pdfIn PDF document text
    • http://espwireless.net/uploads/file/pakusakasarivoxe.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zawenax.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366d00e2a44---fogiwusekojikutexusawazaz.pdfIn PDF document text
    • http://soles2walk.com/data/file/75271366613.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/fidupujozedonagumib.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/zebubetux.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/pevunitek.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/werilasa.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161315cf4acdd4---xaporifirizox.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/40869725772.pdfIn PDF document text
    • http://djapm.com/userfiles/file/65955445485.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mco1up2pqt89678h3ut0u3ia9n/904030897.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210912101651.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/matewavuge.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/sopafajijap.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0ekaokvgoleohvbc1hejs7oetc/59325622938.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc386c4e48---15795705381.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_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 11080 bytes
SHA-256: 24e081d457ad3040f4b3cc3983b7c2d52431223004f59bc6e32cef3dae77f8e2
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 16948 bytes
SHA-256: 4ecff8b4e24c6a0b74d68aaf270a1c1fcbdbff3ee4f391d099015d206a88f821

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