Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7684cdc8263329…

MALICIOUS

PDF

82.9 KB Created: 2021-07-02 06:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 562b2790e57c820d912e680c5c614ba3 SHA-1: a4b8975eed1907efeef23bc107edc607c3bf1faf SHA-256: db7684cdc826332982752fdc39af8f3256bc048b6f2255ae92421b87cd66df5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to mimic legitimate downloads, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=iit+previous+year+question+paper+pdf+download
    • https://wfca-czech.cz/temp/userfiles/files/52416013102.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c14dc674be7---1114182364.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/38401056697.pdf
    • http://classicalgardenornaments.com/uplds/file/61904273234.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160904f80e0bbe---paguburi.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/savexidajazurizobosip.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/60d8a738210b76cd79a43eb50717b02a/kewemisukarane.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oe589kt6ca1cccm2ijljpvlmi/53801097429.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fb3ae055---64701670714.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc255b9f274---25722872945.pdf
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/62667099166.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k249c4krhc0ou16nv3bk7p1sk4/95610227574.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0e7vcik4l9q6g15cfpvdnqilni/71843729299.pdf
    • http://attlas.center/userfiles/file/defajekujutepisekixuf.pdf
    • https://kovtec.pl/eurostyl/photos/file/79476252320.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcc884b276---gowebagasaxijukata.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858cbd7d012---jixoferudurenuvej.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160899118c9ee3---vapogenujovanur.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160805c75b055a---32357056075.pdf
    • http://esrafisek.com/images_upload/files/bifetanijewujonawi.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078d56263465---56706055313.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6fdc808c---74315803245.pdf
    • http://www.aqsclimited.com/EditorImages/file/vozinigesenajefomezar.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_off0000dff9.bin
9636cc3956e8f949ae0c5c4f79360ce7f936a85be0ef7dd41e63ff246ce31aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 10956 bytes
font_01_sfnt_off0000f967.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 16792 bytes
font_02_sfnt_off00011179.bin
6542d1a05c8746f2cb5e782a7ae33528f8f61207c3a7b4a1e9d2d3947bfefad9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 17144 bytes