Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3c24ec589976e4…

MALICIOUS

PDF

116.4 KB Created: 2021-07-13 18:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4778473508a7c4a49c7ea385f46c6c22 SHA-1: ee7cca55a63fd5e28aef21c4293e6ffa115e2d59 SHA-256: 0d3c24ec589976e4a64c53fe6306bb50df7f44c5744ef24ff73fb0ecd44e7b44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdca8a1f1---14123558563.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aae163165ce---gevozob.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/pujezagedelekevujovesom.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/54257571414.pdfIn PDF document text
    • https://windsbs.biz/files/file/buvivagazipopopikitupoj.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2cb5a0d67---90309585867.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713aacebe70---muforovasene.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pvkjl549lmugklhqlrj0skj3mp/87484865412.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/25895729644.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1f466ab4---84405309761.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087303eb0b9f---32174883967.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/eott147l9qi4jt39km4ja26mb6/xanumo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/47063637412.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/bofot.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vawimelumirixexazipo.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/sogixamirojedan.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/707f2912582ebda14f007ef76ddb278e/xejinoripigigolixap.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c39cd0eff---41784749883.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607858bc6758e---malazirapokulabelekisabu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gujomugonofu.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/78a1b29e0f43f35d79fe66a9b0ec7720/78745482704.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a3ba2e9a---24343950554.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q7dchq8bv2gcm52rjfbkqkqnvl/megegubivapufekebitub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=difference+between+krebs+cycle+and+glycolysisPDF 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_off00015f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F54 19476 bytes
SHA-256: 4c9d6d9e4bdb2efd34ff0569c9289934832b1b73795590dc3219c87ff4b7a227
font_01_sfnt_off0001921a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1921A 11084 bytes
SHA-256: dee8e9379fa17ced962eb6c65cba4b6c93dccbccea3370ae5ee859fe913989c5
font_02_sfnt_off0001abf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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