Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d0232c9a8cd027…

MALICIOUS

PDF

87.6 KB Created: 2021-07-28 00:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2925c00451450d77e3dadb343df0d553 SHA-1: 7b7bd605d1fe68f0d365bcecd7d57c01e24875f9 SHA-256: 97d0232c9a8cd027e93113d25e5fe8af69fce651e1e6c1cc4eda8b7be964a0dc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL patterns are consistent with malware delivery or phishing attempts, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a84db4b1c43---rawanakirinofixik.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b10d33a979---84783293726.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/gifizasep.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210710_193637.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/dujirusowa.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/88f2ea4ad62f240a0a2835b7c6ff5bae/41083742573.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca236445b---xokonopowunekusadapomipo.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5986600b3---20709487092.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4ca8f00a48235d717e049fa063c71ed5/dororutijasi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd79306bb8---sikodidem.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/dimamakimoforixuloga.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91d575e8b4---52792399244.pdfIn PDF document text
    • https://rajakedua.com/contents//files/59993310390.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/83487629782.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/98653816893.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/fibipeguju.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609856739f294---wanume.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210614125732.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608366c3a6954---doliwinudugevugexutipazax.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47826340470.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf758b6ed---goxomokanixe.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c07482a824854ddffefb431c84cee884/53947621022.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/nijidifadireg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=o+que+s%C3%A3o+inibidores+enzim%C3%A1ticosPDF 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_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 20544 bytes
SHA-256: c51a35585c74eb3faf3f1734139305e2927746b9b1d5977e9fdf53279802087e
font_01_sfnt_off00011b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6B 11240 bytes
SHA-256: ad683c07d7570bbb85f4617b208e9c814ff76b40cca8c3c02856fec727f922e5
font_02_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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