Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fe823567d025b4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 04:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84c7b4152bb83f19dc845d385468f66b SHA-1: 5be9c55e9267477e190fd6279127a4419eb87493 SHA-256: 97fe823567d025b43b2dd7cb0af703b4734d91bf1bb0d4965d1f8bebc69ddbca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics as containing a link farm, with many distinct hosts pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly suggests an attempt to redirect the user to malicious content.

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612564377ce3e---kamikenerixubigibog.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dbe23192966039ec9a7d9a49377c79b2/dagexijo.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kajuruserop.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93739224a---jexobitalobikeja.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/19813485114.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3308621fd4db3d9ad9ff012739de17c2/76566631078.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/469e9c8504f7f7446bf8e3e64a8f8570/renawelufisuwuj.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/141c97d3432e88cf68cb15ad4c9957bf/24680130343.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/54466487496.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/4839632.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0c4f22d9f---72865792460.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/misigodesabajobadibakedit.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/46613340402.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0eb7cc3a---vafepivuba.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/f35efdc554581932131e4f1510ef1968/suwodotogatubidagid.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///baxepadawivu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qd39apr6fnqorlo5dbt6hrma77/21947869950.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b668d6d9b03ec3b73e2c1a6dacaca434/70549415512.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/29056673278.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/5403777664.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077aadda0fe0---73297932289.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/66633822498.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d573cc6aa2---99682796296.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qc85souh0rba4ek80m0r10bg97/detotubatitawavatapanida.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25607506521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=patience+the+lumineers+sheet+music+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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 17136 bytes
SHA-256: 4b4ffd845769a6f5a0445d8642cb2a25507c93033e2db04c5597dadbc7511180
font_01_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10868 bytes
SHA-256: 288256bf283c85cd890fba52ffd72974f73b554240a073bb5e2b272f1df2e957
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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