Malicious PDF — malware analysis report

Static analysis result for SHA-256 e115b313bc715c2b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 07:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ce9e3e546dcf481a3805e3afcd19d13 SHA-1: d2f5f4fad2b33f33f5dcde924bfa29bccbd7aa2d SHA-256: e115b313bc715c2b39ca9b54a3f740e394faaa010981764407cf32168f72ab32
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=encouraging+words+that+start+with+d PDF link annotation
    • http://aven.su/userfiles/file/xezikewijivexejopivoxe.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/25415109049.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tivironuwilejusogadevuved.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/52475994549.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c7051a9f2---39012932515.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427c30ca0a0---6943707512.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/85666614487.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/sarizo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/39102205150.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/67191341069.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/31585933635.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c69ed798---pevovokigen.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/kipuxuwozeforowijizonor.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/53922476657.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/muzexakazamesidusetez.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitejenafimimadenuwiguwaf.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/98210268117.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/86293682523.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/47690799673.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/50950761558.pdfIn PDF document text
    • https://gencatakan.com/upload/file/wineso.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pejuxama.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/rajeduvexi.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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 17396 bytes
SHA-256: 3082fe7b21e9138702240c36ddd228f0dc756b39ed1fb016d96804bd6a8850ae
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 10640 bytes
SHA-256: 3d37e3e6cc374dd63146bd3891c79de1c30e01cf590e2494b6f924f39068ae23
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1