Malicious PDF — malware analysis report

Static analysis result for SHA-256 592a1f98a064dff1…

MALICIOUS

PDF

80.7 KB Created: 2021-10-10 09:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd06c4bfc24c78546b61077234210eed SHA-1: 3379cad294ddc9f8d3b4a383725da0b1424fe796 SHA-256: 592a1f98a064dff1efed303906eb1fb06ec29f6eba81fcaebe44ec1f835fe34e
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall pattern of hosting malicious links is indicative of a distribution or redirection scheme.

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 https://dursunguney.com/userfiles/files/46380830797.pdf In PDF document text
    • http://www.bash.cl/media/file/47242175919.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/28468839476.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/tofusuwejim.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lubokikepobiwemutuvunipiw.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d7b90975af4eaa0e232099da046f021c/rebevukudik.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613db23f7b638---7624198015.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1ac9cde7a497051d3db966630e4ceb5a/14106291446.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/duzunavu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/95484174531.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16153c2f28d3a4---jowelexusowagageli.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/xosuxaloxogivoterak.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/lasubirerona.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/fetipamukojefosusaviri.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161566dfab2ae6---megimi.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/datakita.pdfIn PDF document text
    • http://innersolutions-uk.com/file/sekaladipuwupo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6e4e9c6b9fde26c53dfba21996ed51bc/danira.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bc4fc13bbaca0b09164185e902abc9d7/27679188836.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/denaboxugupekubimujemim.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/6ceo340di8vghifng1krlk4g0q/fuviwulejuluzafurigi.pdfIn PDF document text
    • http://camonetinternational.com/files/file/73763623180.pdfIn PDF document text
    • https://botroul.be/uploads/63585705922.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/xepubunebuvunozemebefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tree+diagram+without+replacementPDF 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_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10940 bytes
SHA-256: ddcba7949a8806b19005c6033a532bf48b882719b9e383d84d0c0ef49958b5fe
font_02_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 19492 bytes
SHA-256: ae6a72b683692b6f390a84c3394bda35f41ed653c46ade556e04c0ce03cea36a

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