Malicious PDF — malware analysis report

Static analysis result for SHA-256 9727b171f2f782ea…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 15:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41a14b97f904213214362e2019f6442c SHA-1: 9d5a17752164fa36b711887c4244d3aac4f694c1 SHA-256: 9727b171f2f782eabd29fb98e799476fb775651bd785ea0ca5686a55d2d34cfb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised WordPress sites and disposable domains, forming a link farm. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or to download further malware. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://permanentnimakeup-brno.cz/userfiles/files/juxuxuru.pdf In PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/65938877639.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/45847438283.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44300c4b79---vuvogajasofu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2muj4e8atjj9kelvlmbo63muhe/54837595971.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/votawerowu.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/dakapiloliju.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1594d03e74---83440354633.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1ab4110e---17268292847.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161211624325a5---bovidusatumekunamas.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/2211986759.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609073ef3ce5e---fufopinoporimarerito.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9d3b9163---56525990707.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/tumodumedifip.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/753f1dda2757265c9217217ddc02fe41/17411059570.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/tiwujevok.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc78d7af5f8---lodufulojodotaneruzatiki.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/5436969118.pdfIn PDF document text
    • https://landbar.com/upload/files/momeziwelikafefizelopo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mopegovobuvuxowelit.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xosinesu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102f2ffc5795---ratofomat.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb88684247---66718898282.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/bupesonupasejinin.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd124ba75---69939677690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=triade+de+hutchinson+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_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 17264 bytes
SHA-256: 2afa44f0e5b7c6b0a2fd5650d63049391ddc0ec539e5b7f0e7ef35f72e9c888c
font_02_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 10732 bytes
SHA-256: 2155fbf9bfb3eb0fa3835501228a4690dc202713e6aeb8125dbe14951e104f0f

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