Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad448354436b2be…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 22:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4390f9a0d32cd794430f93ef5988b64f SHA-1: bd4fd711b1137ea61e0b9a04ca45b4f4fffdfa2d SHA-256: 1ad448354436b2beb36db54ebc90221ccec83226ce83cbda433d1b05c63e82da
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage download or redirection scheme designed to deliver a payload or conduct phishing. The presence of multiple distinct hosts and the use of form-upload plugin paths indicate a pattern of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdf In PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/olg8ldpk29eicssqqq0v50v3m5/50767373696.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0fe31be9cdfc702cd62c44d88b91ab63/nobudabiwigigimoge.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079098d47287---kapowaju.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/13122772962.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/buxowijubafajironagax.pdfIn PDF document text
    • http://derma-dts.de/files/file/40643060646.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdf66f85e---45331543812.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4tlb6ft776mmgtc7qhsk6jjh18/nudopipatapowalisaliman.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/i7a72le2uf47ovg3vb1qdc9ri0/89529787171.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc45d2e859---30015227770.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/67877749543.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/timojitejizepo.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/dobowiwada.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607783c58c849---gezapuduxavegikewananofol.pdfIn PDF document text
    • https://electroagro.es/pub/files/49263443595.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/63807164399.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/fubepidodanirovitowapi.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb26393b9---zemuvovaxonilinovusofodub.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/betigevagojoro.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c96604225c8---rokurutirisaviduzu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c6348911---31624365334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pain+after+giving+birth+naturallyPDF 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_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 17720 bytes
SHA-256: 4597c73c1720c5866c8de974373578965609d0a36598cb5ff7b964dd2286b3bc
font_01_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 10624 bytes
SHA-256: 98d9f2f2219bcc04dc056cdb29ff9f54f976ba2fac01437d6d0588f729185f62
font_02_sfnt_off000132de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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