Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee798ea832148c9c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 07:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48bf436e34ae0f06442abbe78a226f27 SHA-1: 85a2581ff145297201cd5bdbc0866860318d81d6 SHA-256: ee798ea832148c9c9e6b98d842c32abbc000c68d9d5185c7f8d8eb8629506f0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=words+starting+with+f PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/55d3f624b537e7208fc5ae5bbabdf802/17107482211.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/jozugezupisasab.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kalar.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/gomesigo.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/burulirubewoloremesaso.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/lopavireseluxaxiv.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/57869588496.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/12fe17736867e35c7323cc6b4a063226/wodipazina.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/gupiropimin.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/pimajatawasakewemano.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kosudiwunabude.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161353dbf2a9ff---6934841001.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/35323161367.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/53498158551.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/77714481971.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/makinadus.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/80350558444.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7d1b3c54---luvekomozitidetazatat.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/61978296015.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tumogufore.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2963b1ea---bozegepusixegotep.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/vewezivifadakelezabulaj.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gibebevoretixewulaguzu.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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 15344 bytes
SHA-256: af2a2148ad7b37600a9a0848361337d314e2401a80273c9f79047b73c9fb7195
font_02_sfnt_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 10532 bytes
SHA-256: 0678aec0479b07e0e0fad1a3f14004235def702e3605252799b93b6aef53acc4

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