Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1c006a8a4683c0…

MALICIOUS

PDF

95.2 KB Created: 2021-07-02 15:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 198c5edfac6ce4b8a1a9b73a5d1653ed SHA-1: 06b6f47fd39f166f9dde50da25404b0a7eb6ea96 SHA-256: ae1c006a8a4683c0fe5a077be9c51a5f781234c73869b55103faf22319224f10
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn--vb0b83rba554gca.kr/page_data/file/20210618171142.pdf In PDF document text
    • https://fanaf.com/article_ressources/file/62158155216.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/54d4d7a82120033ebce514771cf8da22/89429720538.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vjktlnms0puemcmkg2e4u81203/zavivobat.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/86450891257.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a2167734---litusukapebovajen.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/boxedozapus.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/52358603890.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n1bmk0v6rg8le07c5qdemge07q/62006689232.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/73199838190.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607251cd54d2e---vuraveminoto.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/bukonuk.pdfIn PDF document text
    • http://sns.hu/_user/file/loxakarigotusadufawumu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e95be042---podaperiwumulububodewumoz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160730562e34c4---74879248686.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/66516136529.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/a65cc32cd939cfc0b3e662d0fbc51ad3/51149355566.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/vunetilekogu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1503549780609ef19ebfc6a.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9301b20bb---74905064534.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608713f9ac23e---naruvanemivo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/40257c8c80de15310ad700152673e89c/8387401179.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be91410226371f1cfaeeebd37ddc178c/82149221238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=family+and+friends+2+grammar+book+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 11272 bytes
SHA-256: 4f93d336ad55c4271404f55d2f49c786e93515aef48e4552c65d457ebb811dc2
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 17180 bytes
SHA-256: 45d291ad780467f9a8d4e495145368d906d39cbc4dba0b08b7715f096fc17a42
font_03_sfnt_off00015284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15284 17512 bytes
SHA-256: 6d2658e03a56f9fde0867ca4d779dddbf99b2ca7bf447a8d6dbf92194fe2dd8b

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