Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b8aa253152487b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 20:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8e6de36e4b033fdc2ca2f018889b81a SHA-1: b0f35878c5672dd8e5eedf6f1542894a7e3c5e2b SHA-256: 99b8aa253152487bc44e1c56560758a4b7ed038d8dbba1eb0eb0a0df08febb3a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm with external URIs. The document body is heavily obfuscated and contains no readable text, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=lily%27s+garden+mod+apk PDF link annotation
    • http://constantcontinuity.com/membership/data/files/geritaxavipewudivofuw.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/16617545467.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/penafixikagunoxetade.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dixiboxenaxezitefudi.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/16903779797.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lukekej.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ximisadotewuru.pdfIn PDF document text
    • https://teamcode.net/upload/files/63912338825.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/ganal.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/nenipopi.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/11073654809.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/naweture.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/dulonitaxawijofozitivi.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/lilizuxorimagimojugujajaw.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380f5e98bf4---zoladujo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318c89be6e1---12380778633.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344b8649cd6---56376105178.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4414e333---49162970786.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/44614282835.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613335a486ff0---25828007556.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/52034115421.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161330f2da5697---wajozevomabefux.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/80460126782.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/78990704768.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_off0000d122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD122 19592 bytes
SHA-256: 35cb3f00ada2e05384f2e1a5a13a82ac89dab78b9f9b46b33d7772bce37e5e7e
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 10836 bytes
SHA-256: 36cfb2c71d52772dcb96193bf534e7554a939857f2fb2a54dee23a1a64b202db

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