Malicious PDF — malware analysis report

Static analysis result for SHA-256 96789191d9aa2f51…

MALICIOUS

PDF

115.9 KB Created: 2021-07-25 05:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49d362e50c42873d8f30a80719dbc6bb SHA-1: 673102a0d120d87371bfbb19165bd52a4960673e SHA-256: 96789191d9aa2f510fdab631defb7d798caed2f01ba1ceadf96a4106a624bc61
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points to an attempt to leverage these compromised sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://healthywithhart.com/res/file/wujitataxuresojipawamad.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073202d9987d---72667882102.pdfIn PDF document text
    • http://praguetransfer.com/files/file/80678729699.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c91b229bfce315fecde9064b7adebd02/47564321466.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/660211dcfbd4ba18b870a9c47e324d3c/tugamikilusurafav.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/49677399000.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04bc97917---sokakipizu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/18384426385.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/wezifezawo.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/poguxamefusufawes.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/80031762727.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c87ec6b6ef0dbe96187cefb25b724b2a/fabumarikoledego.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/72648a61f8ddb54c1247f9a95763b9dc/pipinopejekolefim.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/pgjtueis3vrf7f131ok51ekgk1/sovezevujoxovufonut.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0deabc9e4---dibelar.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc9077571d---72214807337.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/kuzemozelizabe.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tegotuzabupawudikebunade.pdfIn PDF document text
    • http://planbmedia.hu/files/dowejasuxewadatep.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/fdca66902ca2622b182c017ff542cf24/59582243016.pdfIn PDF document text
    • http://ccsl.asia/files/89156016027.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/46656153064.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/xafojiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=test+de+inteligencia+emocional+ice+baron+pdfPDF 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_off00015d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D32 11064 bytes
SHA-256: d6af61462cc484db70eabbd4c7ac134db8ec6f0132fa18bb318df12dc96ec6bb
font_01_sfnt_off00017684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17684 18812 bytes
SHA-256: 8f427374919947e33989b059fd982d2575d3d7b3cf42a371a41c6edabbde4002
font_02_sfnt_off0001a757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1