Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c7112d6a0d6c3f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 08:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0082245fa389a697ab4bc2868ae5335c SHA-1: 80daef017728189d70734590c1f9089a88e77922 SHA-256: f4c7112d6a0d6c3f15c7bb12ea02afb6641408e225d3b05d203b14949b601188
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure of a malicious download. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the exploitation of a PDF vulnerability to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://speakingaboutnetworking.com/ckfinder/userfiles/files/datakidurase.pdf In PDF document text
    • https://fultoys.com/userfiles/11467224034.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/21184082680.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109171725575338.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/72470610328.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/78540296995.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/51789426135.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/28231254749.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece489dbd4---26008211186.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/jazozugorafuroxefaramafi.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/41aa32dbd921fb719b5ab242ccbda86b/mokaradi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pakekuvogepuj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2cca65bbd0f05733c5c67ca814e7b839/64833662095.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/68022246986.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/70097605567.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060458529254.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/witutovopigelisam.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/50504694692.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/66060549201.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/bifovoforegixoxipisesa.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/zuzujudarefojiva.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/72171071528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+recovery+data+corruptedPDF 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
stream_004_off0000eee0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEE0 10556 bytes
SHA-256: bde6eece23cb3b7763ff76329dde72cc1a7acef5c81625077af4f4fff5a7b573
font_00_sfnt_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 16712 bytes
SHA-256: f8fbec6cfc03b409f51525af277c040bd209c00700707f1e3b74932f8c19a9dc
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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