Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada871e86029f4da…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 05:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d86b7d23986e84ac0e75d01e82fc3b4 SHA-1: ac4f53bc59c3c4fef4dc7f9c8e8e5fb4c8f10a32 SHA-256: ada871e86029f4da13c55119c86985e7e45a5561f34c53457db53255ebdc4175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV and an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or scam campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=corsair+k70+rgb+rapidfire+manual PDF link annotation
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o8jtekuj3oihp2536nggokc6u4/tuwimilumufebisudadob.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/308bdaadfa0f4f31bc8515ce5f50c52d/rovil.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/161325mpvbapcs1r111vorsnc5/5565004606.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/8753887860.pdfIn PDF document text
    • http://vejwun.cz/images/9729477981.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f07c185f---lixinemodu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/divixinerewira.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa979b57630---84619261995.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/esvnnp49isbvp8nmiinh67cnq7/kazogogali.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vasezulifipewesoberowogu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/32488422598.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7e113168---76597554932.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/84657267463.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/sekejugivazoligilaj.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/36295535298.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/wagadob.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/15150170403.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d32e414c---28583930682.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/waxinorivitigegakajisijej.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/vewajekaxigo.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_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 11276 bytes
SHA-256: 8f0e31d1c8e7e2518f4893f9fe7a507225f8b3f0ae5c4aba529a18aaae720f0d
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 17676 bytes
SHA-256: 02210a9491fdf2bd4378c928b3e7221d9481150fb0881a7c29484a3d5d77f3a2
font_02_sfnt_off00011190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1