Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3512d979f6eb43…

MALICIOUS

PDF

81.9 KB Created: 2021-07-27 23:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1b2effdbeb0b1a9f8176b1df4d10ba15 SHA-1: 1820b3a5df094ad998e61533653252a578cbc7ff SHA-256: 6a3512d979f6eb43ec505a46edbf2af33238708b664ac9aeda380537383df274
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The presence of embedded URLs and the detection of a link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://billsky.ee/files/file/xanovajirojufiwiwijaxen.pdf In PDF document text
    • http://tokstar.com/_UploadFile/Images/file/3012244608.pdfIn PDF document text
    • http://vswet.ru/f/92714375623.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/3972457144.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f4c3b039e0ea11c439eafeb63a7c90fa/kebemumamawadogufobiku.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/similelaxasikonujalivu.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/aqkb1b14kdv55ht9g8atp702i3/mifujuraxobeniw.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6pbo30o6j35lcph2fuooh4ismp/73355038897.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/dezutixasiboja.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/nobumumigelasesa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/eed0c6bf4ec5531d2bb8da044b90a7f5/51745035299.pdfIn PDF document text
    • http://talleresjpg.es/img/file/9666119322.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/50807500202.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d2a837cf54e302eefcd72d591c978714/43695317383.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/14884735549.pdfIn PDF document text
    • http://flirdining.com/uploads/files/58457453094.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/85fee1995a5be61db2892b19a928c55a/bebixadokirozakelinogetew.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/92551475123.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/rojozozapiwezoga.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a999c82433---42597728605.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/4ab69b37ba1093e12d8352ee90e30670/67124756622.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d180c510c5a2d4dfa9c1c5a9a0483d0c/95575889008.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/1675898102.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608722c58e91c---rutegererapanaboban.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/55014653911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mera+bhola+hai+bhandari+lyrics+downloadPDF 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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 17084 bytes
SHA-256: 49b867a7049135faf71d6db950af19a59ddeb693752bfc32b7a4d2f7f29af169
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10700 bytes
SHA-256: 5a7055c78e835e769e2e3010323386af9b3349c58f811d94033663f25b167a71