Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4199f25e68109f5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-02 07:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c17831c868c9ac42387a6df7ee70bb36 SHA-1: 3d67c32d3315369d25fd01babfde4293a7a96382 SHA-256: b4199f25e68109f55953aa5195c649bd3c4aeb18835053ce4b463273c96167a4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs and the nature of the heuristics strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=why+is+the+rafflesia+endangered PDF link annotation
    • http://dobrejaja.com/Upload/file/75888238305.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/29197727645.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/degadogeganikepeg.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/18011579301.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/kemalamosujos.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9fadcfac862b184acfacf38612a31ce6/15784105656.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/mozesuwemimomazukobamiba.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/3703851973.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04e318206---75156393187.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/kiposikibozefa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de61e9ba99f---faxawidekezugidosividok.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wunadizeduzogam.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30b743bf8---xizudidekered.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xonobezumotusilo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9515039df710dee1013b11cee65c0a78/86083555596.pdfIn PDF document text
    • https://promtong.com/promtong/temp/file/4982837495.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/xaxobebukatolalojawe.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/rikojawosojuruzukalo.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/fefubopajogeju.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68936a779b982231736ae6e5fbc85d6b/luneladu.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/motawumekimeximoxides.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/16356185380.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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 17264 bytes
SHA-256: 92688771ef5ef06ac78adfa3f245e346c3c620fc8ea3dee10e072b0d79a812a6
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 10620 bytes
SHA-256: 235c0b8e46e83511b226213287fe9a077acc1a12ee8837549afabb1f2e775b30
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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