Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dde510eaa28b4e…

MALICIOUS

PDF

143.3 KB Created: 2021-07-15 15:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fd4d244622486979fdd1601af4bd364 SHA-1: 0e26f5c2e3c4a6d4cd8d2a94e15c104777430128 SHA-256: 84dde510eaa28b4ecd59abeaff3c7f1c411f56b0deba352ab4cfe4d19bf1c8de
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=most+petroleum+producing+country
    • https://creteservices.com/FCKeditor/userimages/file/26567980929.pdf
    • https://dm288.rs/slicice/file/lelurufujubajafapa.pdf
    • http://stalmont.eu/userfiles/file/sexezodi.pdf
    • https://binarbaid.com/public_html/userfiles/file/gilal.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/fevujomulujifizeb.pdf
    • http://toshiteriyakiburien.com/uploads/files/40057702368.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160870c37d3157---zarelisutuvedewagapagofi.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f451780b5---43953515189.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/82588920299.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160982e2029e70---31573550542.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56758903512.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d8fb5606ac876d1b685fe691125db0f2/76931697346.pdf
    • http://fitviewer.de/files/file/74105471427.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/229c93c88167e468ee8045866255d20a/13980536491.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4c03303b79bf6436a5db215efb94cd48/23433294998.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/18706667900.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ctdi0234np90fcsosdrb9cu85s/62864655976.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813f1f20c6c---bumone.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078acc693d5e---pefutosurekuf.pdf
    • http://scheidenschiedam.nl/uploads//file/10408573532.pdf
    • https://louvre.lv/res/wysiwyg/file/xudonodizemavemifevisaxa.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d39185ea8---38174394208.pdf
    • https://sonarmusic.hu/up_image/file/wodopitemoteka.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefe69556d---29032294458.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160937d7a26140---jofonab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cbb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB6 16792 bytes
font_01_sfnt_off0001e3c8.bin
3d7e5df1bdb2d2aec1c476ad447c78ea6972f640d0986f6148fa21a1b4fdc14d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3C8 19556 bytes
font_02_sfnt_off0002160b.bin
f4c2649c6815863a32c3fc2ced906065278b8854ad5285a342950726764e6512
pdf-font-stream PDF embedded font (sfnt) at offset 0x2160B 10904 bytes