Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e6af00cd2cf60f…

MALICIOUS

PDF

146.2 KB Created: 2021-09-07 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e72771e21810c47c8a9da6ee473c7315 SHA-1: d0a39323d01ae841ef1c691bf29425841cf7f0ea SHA-256: 18e6af00cd2cf60f82e2c0415a2b5f21b02e9251bd8d9c0f25ca16c35b44590a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple external URIs and a link farm structure strongly supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://nulifeus.com/~nulife/userfiles/file/bekukivobalereneg.pdf In PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e833f24a8e87336418bb75288b92d29f/49421901428.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/vegoxonabubudupotitidetos.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b108e59fd---xuxof.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/livetikusezovoges.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/66558913614.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/badiwosoxedajajekixeko.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9dda4e94---53485300997.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503041230402.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/5222714137.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b74695ebd---108739575.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6n8ibth34misnmu6cllairatg0/xefuwimejaduxujomixadeg.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/puxitawi.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/vigopanudotexetimopuvifat.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a09c5b39b---82517662870.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/36135963550.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/61146803896.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161291980546ee---gitilakudagobad.pdfIn PDF document text
    • https://tcremich.lu/files/files/66728989505.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/88613676931.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d106834510c5b138b74e87db1bd81f21/wubekevuravibibunijuruko.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/bopizadejabaf.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f04b8205---nonifajugomod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=market+leader+strategy+pdfPDF 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_off0001d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF03 19672 bytes
SHA-256: a10605caee1c65c4a94e1dfc57054e4582c70c9b19f5ae7565d4c23ffc079845
font_02_sfnt_off00022337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22337 10556 bytes
SHA-256: a2769c21f48b1911449f98fbba2e5dee37e711cb782fd19122fe907c8e144218

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