Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1212cf0952fd95…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 04:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eadef7cc3fe784a8845e3ae3cce487a4 SHA-1: c822e07ab66830794525d982fc5e5f3af4c56dab SHA-256: cf1212cf0952fd95d6d7fde8f4c8edac522a10b31602e1dd1dda4620d8478162
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.hausbaumesse.at/ckfinder/userfiles/files/gevuni.pdf In PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8715389f3e6b06c245ec3845be9f74cf/62939340849.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/mafijikamovodavajexexuma.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/tubedewepazuwel.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/68982450696.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789aa5de431---40021707908.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/31735573332.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/94024480735.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///4527963952.pdfIn PDF document text
    • http://labradory.pl/file/resotekewopamatugopeg.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/n9a345vrrt0ug4ceakiblq94q3/sivogosalemevedakifitozu.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5afd98533---bisetikeludomimivimijipi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/l817gr594k8aaoo71okgsto3ei/75898002480.pdfIn PDF document text
    • http://indemo.pl/Image/files/79107546623.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/7uo5qgfc64g8oqas9meq7b2mlr/dujagorofubekomotezap.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/44061092048.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/ropalatalafivoxakakose.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/benewepifimosubejofaw.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/32561652504.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0d3dbde4eee1bee8e3fd326c3156e794/920937599.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/tosizabodajafo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vobogufedek.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/46277060678.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/16178705736.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/botunefisobagas.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/85951927179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=use+of+to+in+englishPDF 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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 17056 bytes
SHA-256: 4429f47cfcae118c6ad695aaf654451740bbe6d3416ecc23955778059acd1ee5
font_01_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 10236 bytes
SHA-256: d70b1cf4e85b8cac5b6af0cba29d47af2c66b8bee1633f73af992c580c2e32ef
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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