Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59b7d033f00ed23…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 10:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f48ed2fb8c3d92ad584b067d0eb1cbb SHA-1: d36d0063c9bbaff22edd3415f758397b576a0cb9 SHA-256: b59b7d033f00ed237d9c2691355df9c08682078421491b21a5c7f3f1047d7eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=need+for+speed+underground+2+android+apk+data+obb PDF link annotation
    • https://elearning-chemistry.ro/userfiles/file/dagewatatofinu.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/nerovomi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161419e63350cf---12182285301.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/99915091455.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/lonutakugebivugazaboreru.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/23016744755.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/87350885457.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/39587822136.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/50be7d7059011484d60989ed5751fa2b/lipegorinesewonubu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161358c0a14b3c---16771950996.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/wigiguzowofugosefarurod.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/83799162313.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf0dd45aa9---67853053088.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/rikoz.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/torofawowexezegedetisol.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/sejitejir.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7820l9aef33gf02i913codn7dq/19633389532.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/gamomur.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/vowososamuwu.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/35036163617.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/varakodutamanar.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/68769728086.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161413a6897f94---figaxobed.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/98683594251.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/zigudidepoxa.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_off0000bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 11056 bytes
SHA-256: 5edab9be61d1144ec97b7b1a8664ea75b9beb757708a08c74441094844718b06
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 18044 bytes
SHA-256: bf79c25bac9127bd2655140f3093daa657bab67c6cd5d22bdf9edd944b00bad1
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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