Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80fbe876ae204d2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 05:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0360665c01f56e7f9fb58ea6772577fe SHA-1: d0b993515f717daf129eb2f2eeaab75f69bb445c SHA-256: f80fbe876ae204d23e4b1f919e076078bef4e380c00674bf123104a1c1f67e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised websites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely a spearphishing attachment, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://wastran.ru/uplcv?utm_term=download+panda+helper+for+android PDF link annotation
    • https://dolmalatrek.com/userfiles/file/54410463539.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/direkop.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/gatevepekibe.pdfIn PDF document text
    • http://congluc.com/upload/files/tawosirovune.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5624311---14834022842.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jupakujimukejone.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/lupubudiwov.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/2921324125.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q0cob9rc8kbrpfj60fc9at57dm/51288862781.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/vasasipabodavogeg.pdfIn PDF document text
    • https://oasis-travel.ro/files/89275141387.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/67082036989.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/zijelonude.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/96667413192.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/sebigawupekivedarelu.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/82316787788.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/rakorarofet.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/p2ifutbplqjg4hbctcl6oi13om/51612718039.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/xaboridaso.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/tuteloxetefivesa.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/tudanumise.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/80855256502.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01fdad4d2---44376616365.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4dfb329ca---78419911243.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/wufuwifejufufiz.pdfIn PDF document text
    • 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_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 10416 bytes
SHA-256: f0c9ddb823838a3ca7214fa0b0cb7eece2346879b6d8cc7bd81701584c625b2b
font_02_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 17916 bytes
SHA-256: 6f39eae6f403dd4a6fdb5e2adb0f59e0b382582b29a2476004edebe3271f6ed3

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