Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c54e95d3e97a00…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d99437c548d847ac4f76cf735a63af44 SHA-1: e3d1b7301c1842a4108a1a651e0abadb76ef948e SHA-256: 47c54e95d3e97a0070cd4ea9fce8b8f8b1267715ae031173875041032093d956
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical finding for 'Recovery secret / private key request', indicating a phishing lure. The ML classifier also assigned a high probability of maliciousness. While no scripts were explicitly extracted, the document's structure and the presence of numerous URLs pointing to potentially compromised or disposable hosting suggest an attempt to redirect users to malicious sites for credential harvesting. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://fotossc.pl/_files/file/topisowujubotukijefefutas.pdf In PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/gopis.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9f09c427---nitegavaviwijewarepebiviz.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/petikebukagep.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/73dac8a7b19b606d05c3271ea6fd8768/mezaminunotobesijiva.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/sokorasaremu.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/madumopanafototavasu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b728a5062a---dovuwilomularodaminade.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a1375ace7---jugixoxisis.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079215097caf---tozepisomuvifalodosedi.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083ba4218cbd---gamigigapexukifigowa.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/19596592184.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/jujawivedunabapij.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rulobupu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/51929602080.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/6210299929.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d406baad79b.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0e950d4a---12336620940.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/zadasiz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f08de3de5---zonotemekujumujosin.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16082e03cec256---7025352108.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c0d8e2cd6163338c527a1a0ff218a751/76831312618.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/55358341739.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/ruruzexow.pdfIn PDF document text
    • http://htygroup.com/upload/files/liduregigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=paillier+cryptosystem+pdfPDF 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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 10792 bytes
SHA-256: 8338e53bbdf8e6a0f8f7865bcb404ed459cf4280ffbe5cd30591bc0e170a9ea4
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 18804 bytes
SHA-256: 27844398833e92c302161bc8c35926165a1253010c7ce26da172ad62fa59f045
font_02_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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