Malicious PDF — malware analysis report

Static analysis result for SHA-256 8722f06594e48b4f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36c599bbdadb44affe2d20a1e1d5f398 SHA-1: af35985ae615d59ad64e285d406d23e4558450c6 SHA-256: 8722f06594e48b4f49b03dd1209cb53f9b17feac6799bb2ea3168b46c1ab8897
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a malicious redirection chain designed to lead users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/5a456fdebc39dedc38971bf57be8af32/80059020166.pdf In PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/ludewew.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3d3c999e5cdb28f215a9ed0d14685d0f/98167564533.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c67dd73f833---29936676995.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/89125473873.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/kepoj.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083edc386e89---bisunininusepabop.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e292ee81ff93f86706361dc21bc8bb46/82875810242.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/33881216728.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f8ef5845c487e9e18be45da4953775f7/52700895752.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/vazezigiv.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rogojutaxilazuron.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/roropaxixozani.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/e4t2qqnso791j13gf61ssk827o/puritalupagik.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fc1f161581d4973466a6c9328c02ed16/ganomisogexugu.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/81859135405.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/gewuruxedibetodagetamenut.pdfIn PDF document text
    • http://gibisch.info/files/files/benuladivutixikopujir.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57765437a13fef3fc2630a678e222b58/81164659879.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/97891825545.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/doroliluduveduxa.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/39865726790.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/89ad083f9592ea309428207984d47d78/37697929616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sentences+with+helping+verbs+and+main+verbsPDF 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_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 17464 bytes
SHA-256: 69fb14827f727af2dcafb12d854fb4a14536f3bca48e8630399c6db7b2f6afbe
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 11208 bytes
SHA-256: 95d1b6424688dbc2a91535473e1954115f5d986d5e2d1babc1de680c2e00c563

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