Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31c0dfdcb44a1de…

MALICIOUS

PDF

87.1 KB Created: 2021-07-19 05:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80dde33070f6232ec05b659ed564228d SHA-1: 902261844857432c8a2728fd4360c5d9a323dd68 SHA-256: e31c0dfdcb44a1def450faf41cc52741d36c484e37a3f0f6dcae84becf498625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to direct users to multiple external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4e2e36113cb7b5e5c4b7a59d9fb1c3ad/59520529988.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/ramomudabeviwavidada.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824e6eba6dd---73309626758.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5521d231d7f59cd7a63ae2e5175f0c89/68535273338.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48c4f19e2---23206725668.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160893d4fa5b26---64479510596.pdf
    • http://gsemilia.it/userfiles/files/13441536382.pdf
    • http://isystem.hu/ckfinder/userfiles/files/64885895763.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/99828758560.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8c65940f---fixibivuzoxujika.pdf
    • http://studiobonvino.com/userfiles/files/tovekodegidazizunutif.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f955d8e3f---98400132602.pdf
    • http://hjtech.org/admin/upfile/file/susamasunuzopikewi.pdf
    • http://travellightnepal.com/userfiles/file/27783787643.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5aae4e915---nesebanejunisawavuluboxid.pdf
    • https://naucharts.com/ckfinder/userfiles/files/fulupukavizag.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fce59eaa7---jikimidevanixewipiragu.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7okupoafbquh51l3t45sspt6v6/74278729080.pdf
    • http://aklond.com/UploadFilesfile///2021043020164380.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8afc8cc1---totifatawawotof.pdf
    • http://strap.sk/uploads/files/kuwajavepug.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f2da3b216b3ce5bebafe6054540fef3f/33054567877.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0158a69335---pixikikasagixinajasa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+kingdoms+of+ancient+egypt
    • 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_off0000f0ff.bin
cc41cea303d59e9f14b022d58e2a29352b4124360aee485bf85578e613d4143b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 11088 bytes
font_01_sfnt_off00010a8b.bin
4a8ed24c0d7ca90ffbac0f8c4ebdc5ff5f35b636ecc411f0bdadf514567fd9f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 16540 bytes
font_02_sfnt_off0001358f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1358F 16792 bytes