Malicious PDF — malware analysis report

Static analysis result for SHA-256 9523e05dbd33ec92…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 14:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c35718f52fd033f456c58a7080a115b9 SHA-1: 119f7d5195d498706e73a46bc4618b3ffb394e11 SHA-256: 9523e05dbd33ec92b4645e9167a38fb6bfad364de09b6272da42f3138b38cbaf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack where the initial PDF acts as a lure or a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf297aacad4---33621890094.pdf In PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160baca1bbce3e---kuzupex.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/89219073872.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437ab4c06b---4984261109.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/58631010986.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/zalulowodewon.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/269aa6489722ed39b2c08b1d19c6d274/rafewoz.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/bavovogudowudenupiwafe.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/21854966934.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ee5c5945---90454615212.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821858eb673---tavajumubuku.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/janoraxumajibabitumafumo.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/ronojezomoduzumoredopa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bdabd013804ac31b82615d1402c22cfb/95108814696.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/zofeg.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/75180274497.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/70d8984b12edfce90db0a0f4cd7b475c/pixap.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b2f16bf502ae1d5cb8d0f3fadda39466/65102748991.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/tirab.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/sutaselezakexobekifije.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/58322769026.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/66005108390.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/fuzememar.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36bbaf725---12241358241.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/popef.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/forubekiwalaxemerapubeles.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/wikovoxorenit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mouse+4t1+breast+tumor+model+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_off0000c62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62B 10828 bytes
SHA-256: 23d436aaef754517ecca94d4e5bc63ad37840354d23900b612c2413a02eb480d
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 16432 bytes
SHA-256: f610b06ca9390842afd5f17dd06f3c317a5ab4882154a6928e4cc9d353cd2337
font_02_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1