Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5b4f7d91cd5449…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 10:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d63f81e5e3e8a8311f530f03a0441ca6 SHA-1: a0779a8ff71ee132b7dfd85a057b512cb5d68435 SHA-256: 9d5b4f7d91cd54499d6d08e34b46f1d196f487eab451251b280519267b430cb2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of link farms and compromised CMS uploads. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://hoanggiaphatland.com/uploads/image/files/62026706605.pdf In PDF document text
    • http://donghotam.com/luutru/files/poxabofeb.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/88058021795.pdfIn PDF document text
    • http://jar-ted.pl/file/4249463269.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d532b5f6d---70627188860.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lapejukagunusi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba0c271e7---97590347545.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b30607042---80136412483.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/resozikujavetu.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/65853161814.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/37343504938.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/zusalukupe.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/xakojepizewiwixubexas.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/20230441476.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/jepewegas.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/nimozedeto.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/tagaganesoneginutulov.pdfIn PDF document text
    • https://pr-dienst.ch/file/gofipopimewuwozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=8+letter+word+with+hPDF 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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 10108 bytes
SHA-256: 208068c065bf59f25ce1587dbf51703bbe16d776394a15b01de521b6af2ac1a5
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 18144 bytes
SHA-256: f4d270876fe3ad612c2c52d39b75d2d9b7304e55338a1ad8eb86826d5b5c2b89
font_02_sfnt_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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