Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab32cc218e9c066…

MALICIOUS

PDF

138.6 KB Created: 2021-09-13 03:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95ad80b6565d17d7d116694a0d34f8b3 SHA-1: 71f271ba6ab585a68694cd6a6a54ecd9187a5207 SHA-256: aab32cc218e9c06646c90eff5c21979d49902e6ad699b5c49606b1b44c88e9f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external links. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://electroagro.es/pub/files/najadilivawinikagejizeri.pdf In PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/36795427493.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/71121308195.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/jesazetipavodetamu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161398419cca01---jelogakosuniral.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/51142453306.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a7da0087---45805772177.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/89567236902.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0b81d775d55e38880b27f990e05ae0a6/20821698436.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vagosonisuzanovikire.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/1825023324.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/tunubivebekala.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/febep.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a61fa34d16---23720467703.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/im9lmejjqqbqmj4l24dgubaqla/80700933873.pdfIn PDF document text
    • http://mebco.ru/images/file/vevog.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/13474350315.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/63916443845.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pitemas.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/sotabawenilexibuger.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c750328eac---desatitesizabewojijozifo.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/gapanomu.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vamege.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/suxidorata.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066fd9ec37---zunikewogeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=tamil+movie+full+hd+2020PDF 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_off0001b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4F5 10520 bytes
SHA-256: 55bb33ee102f0ee16f5a3a93c2f25b29302081b5b55ada3af657b4af2202e5b6
font_01_sfnt_off0001cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4FD 21060 bytes
SHA-256: b801a12b9c6f67c7103a238a311ebcd19455635250d7ee054d80e8af8b398ab1

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