Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ecb7aca12a01cb…

MALICIOUS

PDF

79.0 KB Created: 2021-10-11 00:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d4f8d4f260759a7bd5b7fe3d555deaa5 SHA-1: 9671f2e1278053fd3668ad1f331b14fc12b9537b SHA-256: d4ecb7aca12a01cbb309c2fc553f827bdd55de8d7cc3944d7534155f5a0060ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=residential+home+builders PDF link annotation
    • http://besttailor.info/ckfinder/userfiles/files/jixenugululasegabuvuvikuk.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109212216587120.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161b9ad7c672---19639622286.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/74528704253.pdfIn PDF document text
    • http://gibisch.org/files/files/57557520686.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/gajirafojixekugasimidijog.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3128f4c0372a48e7b28e93c7d297c898/87172205391.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/woruvevoderoguzabobije.pdfIn PDF document text
    • http://zzquansu.cn/d/files/29276866853.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/litofidunididewivuvi.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210917_145134_144.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/kanetoxal.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/128622f6131c003d1a2e85093020a5e7/7583228386.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/tenarowerimitosavetobiner.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tedanipalivulofesuv.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/velixumumetakamabogaxa.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/60984809508.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/butalezimujina.pdfIn PDF document text
    • http://capri.lt/userfiles/files/zomodasagofedoxiweweg.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/86659109406.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/bijibowebowe.pdfIn PDF document text
    • https://combrooncom.com/contents/files/xirixu.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/59500436730.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/juzatudanevodexuzoset.pdfIn PDF document text
    • 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_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 17076 bytes
SHA-256: 555b338a28219c0b0021e21bc8420550875fac6ef1601fa5aeb7e363e85a22b0
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 10796 bytes
SHA-256: 77ca72a2b717cf8618fac4851b798e598bf9c6fe608d3d7f3413d19e6b4eaeb7