Malicious PDF — malware analysis report

Static analysis result for SHA-256 b037679c9aac1576…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 09:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4964c9d426ff06b882e48782d7f32a57 SHA-1: db7d83ceaf346015d3e04a48d282a446cee04ca3 SHA-256: b037679c9aac157630cd1ae28816ba43350ca7b926049631d2120fa040239b25
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users. No scripts were extracted, but the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://digivideos.net/ckfinder/userfiles/files/jasojuwafubibowalo.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/fiwemox.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/nukoxoxuladuzodo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccf3107c04---53088350758.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d22a6a72e---sawuduvij.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/wubovokokekelovexo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jenevasoliw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ef56f7e5131eeb926391762cfe04123/baravaragakuzulax.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/54326475733.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dusojokovonidova.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5s3qp4260eiieujogae1fc02cg/12839907285.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/41095235766.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cde3c02f03d15aa28473f6bc76a5e92b/34325590449.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb8f87fa1---baputaluvolej.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6df1cbe9e---wivitelejoronirip.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/fotijovilokipetanosuga.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93467184248.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ibekfp7c53q3knhl1ne75elnbc/vapuz.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/funaxivuwelupoxaxu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/24356135011.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573653e7ca---nizedofonokibusivufi.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/78539440541.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940f120186---solubelalakuvomopovi.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/26341837933.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/25082701587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hc+verma+physics+11+solutionsPDF 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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 17500 bytes
SHA-256: 3dde089658122e2944f83f7473fff08e9df895f75c1bbcbed00dc386cfbe047b
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 10964 bytes
SHA-256: a0ad16e60285a026a17e0a4dceb4ba1550c357923ad9fce8a3a18be9d743c9e1

Open this report in the interactive analyzer, or submit your own file for analysis.