Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac9d00c7e2c3038…

MALICIOUS

PDF

108.9 KB Created: 2021-07-18 20:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 287e9e4b7594b8091cfcce3fd00ea9c0 SHA-1: 2c5f1de1a403927403b3c747d9dcc7f98b30c80c SHA-256: 3ac9d00c7e2c3038836ccb4df172a3e945ee8255337bc59e477b8547c286ef41
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document is structured as a link farm, with many URLs pointing to compromised WordPress sites hosting further PDF files, likely serving as a lure for phishing or malware distribution. The presence of invoice-related language further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1920318b---girapikolijiso.pdf In PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe834094c9---75227664612.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/fixiped.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199069842221.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd15d5ebe---dibazavijedudujufozuborif.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/79409240589.pdfIn PDF document text
    • https://proxus.nl/file/ripovas.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rtimf4d2qft2urr0h9ih6m5mn6/2602696005.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/dasuxidasulijoroxef.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/30cc4fef9dd25f72348b2a7e863bf403/tapadej.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae0b79fee8---bonogaderev.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607181ad7bb2a---wojigigonufokuzo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607211b00f0db---92856371991.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/550cba82f964ada8fce283811210e7e0/75589997380.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210615220109815.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/18c412787938f8a157b3b1219fb1bcab/66103579100.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/k0nhne4og7rtngq8rnecbdegiv/zafasifivokub.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a5e326d09e345d0560d367f9614e2f8e/xuzaz.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/50578518114.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/lutejolil.pdfIn PDF document text
    • https://blogsma.com/files/kutewubodasikeg.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4d77238f---61894616679.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4c144e0fa2eb42eaae7fb9833727f78f/80826729267.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2e168f8b---82073030294.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/94616496156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ledger+in+excel+with+formula+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001470d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470D 11000 bytes
SHA-256: cc552c174510324ea022d0032e99fb23723fc11badc9ef5d7345434d16f0441a
font_01_sfnt_off00016038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16038 17504 bytes
SHA-256: ead728aeebbeaab19ac05cf74e2981227bea7ce3b2d2e9787458f329241ea05c
font_02_sfnt_off00018dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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