Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f09aeaa3a963da2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 20:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 411476535b0c8b4318515dc99f4edf11 SHA-1: ca5fc32f79d45d71ab3f234b17802d38bb20f4fa SHA-256: 0f09aeaa3a963da2ad424eaa7f544fb48ff1da5377221b3aa0a362d91f518a87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=psd+reader+android PDF link annotation
    • https://arslanemlak.com/E/file/In PDF document text
    • http://aybar-gallery.com/userfiles/files/84211262512.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wururedexomibanija.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/28009668278.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/9599311562.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/52008591736.pdfIn PDF document text
    • http://turnyras.lt/Files/file/11643664184.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/ritaxovojodofuxujaritefe.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/96215871271.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/kamiwet.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4199dac754f03630aa99e74c9b13e59c/37806694072.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/71650095029.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/jerufivipufavamokipibuluj.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/6902508305.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/97241519176.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f563168d8---82717213015.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48034836987.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/57954393933.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/voxepexivelewiro.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312065452319.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/27186691769.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/vinuterimosixe.pdfIn PDF document text
    • http://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/52981284066.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/87052587059.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/19279852547.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/15269918510.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe11aa2e47---webunorigak.pdfIn PDF document text
    • 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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 16996 bytes
SHA-256: 7381f83a24cd9d0f77be005d17d1e8e156d7dbbd4b3d1151bc5fb77a72c6aaaf
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 10096 bytes
SHA-256: 82f43e37a42ee2710004f98b244d57abf5dc64470298c91e2096f5233d4a6fc6

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