Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9baa0ebdd7c8407…

MALICIOUS

PDF

86.2 KB Created: 2021-09-12 11:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff48b43ad97780196917acaa255d7f7a SHA-1: 135adaa103e4eab84aa63caf051772f90e52f55e SHA-256: a9baa0ebdd7c84072b1e08dbda3460ad1307a2298782bb9436cf4f2d7a2d1d10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external resources, many of which are hosted on domains that appear to be part of a link farm, with some links pointing to compromised CMS upload directories. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of a link farm and the overall structure suggest an attempt to redirect users to malicious content or downloads, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://geometrarontani.it/userfiles/files/ronezenizasiduvefebe.pdf In PDF document text
    • http://envisystem.com/upload/userfile/files/vagidufetimitotipatozasug.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/34543970659.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/tosutebonokuxalixi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///73263371779.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/99596518194.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/mivefexafes.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/83752335376.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/133f62b347a94e21eb25733a92c2b492/fitofixovifupifose.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/xesotusinuvawifudobilu.pdfIn PDF document text
    • https://agermag.ro/mm/file/lavesejelababof.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a23deaae9f---bexulaji.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/sagak.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132535f32d2f---93435811557.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/29613162892.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e9f7524a---metefinisizunavuvozoleji.pdfIn PDF document text
    • https://wmu24.ru/media/file/porineniwujolivurev.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/ridulolip.pdfIn PDF document text
    • http://gardatrans.com/content/Files/sawaxaguxo.pdfIn PDF document text
    • http://lagrupacio.cat/file/fedirejibut.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/56873272524.pdfIn PDF document text
    • http://wmsone.com/eimages/file/raniwirutavobewuxekap.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/kopunepumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=free+video+volume+booster+for+androidPDF 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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 18404 bytes
SHA-256: f8b0a377bba4c0572a6497208a415ed7ff0eb4da237b3f00afb36e5fd35490e3
font_02_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 10800 bytes
SHA-256: 184dc744c78368822b686a9fbaf6aed175161a09cb68622f0799a713bd916ea1

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