Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33c3ce56f57975b…

MALICIOUS

PDF

78.6 KB Created: 2021-06-30 02:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef62ad819ef39bfe267f789cab9a4032 SHA-1: 4901a4fd3971ed98e3cb7305581b4a60aec41937 SHA-256: e33c3ce56f57975bf62b219dfd6b13970c89f9166ea5992c29633084061cabfd
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/8141vj0i3pp97ob7pg86hecp0b/79755188591.pdf
    • https://tidurmalam.com/contents//files/31588280338.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaad159269---bavoraxabonozizelananemu.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/bijozesokaniraputemoxi.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e85f5bddf8d757aaae2598a606cfbcf3/gikivebimorazamem.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ef0a2a2c---88861286867.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4c642541---govajoditejewe.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/rojenamitax.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/ba618553f344bfd569f9db84831ae113/notaxilozu.pdf
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/nokimafa.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50f8f1568c---denogalimuj.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/womuxubalexukegubomof.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iv1ukao81p6vv2s134bu8dokc0/gefedunitulig.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a4c1876a---wujibaju.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/clds105mbu8m39ugi4hehrefn2/50483704498.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c94fcced707633011975faf4b1fc6a75/bilalezomosumuxakufeg.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b9a0cc4da---70902403689.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080735869702---43568465102.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c29ba7e7---gebutobosidodidubixiri.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/3sbqcb9iajg07q4d3eb1bftj37/fatofonigonefujefogu.pdf
    • http://fw-simple.com/uploads/files/71525772937.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b835322068---tiduxutunezadodimimupudig.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c8a8b07d6---vixal.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae57547d3345078b3f5f58b1eb9ad7d8/11689023402.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4db65f529---divojeberanuxatedonivepo.pdf
    • http://baohanhranghm.com/upload/img/files/jofadunoluxesemo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=polyarchy+participation+and+opposition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 16792 bytes
font_01_sfnt_off0000e7a6.bin
235c41741444eb64433b96fdca986aa6256a176f3cf6c3c20425f1bba2074cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 10700 bytes
font_02_sfnt_off00010029.bin
532252d1e666062239f34e095e2f5cf3a651849860763e94ccc306fa57311a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 18092 bytes

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