Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8743b45bf33ea3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 17:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e80fe877e5b4c226043a19ad70aa763 SHA-1: 516f0ab65aadb70aa4c0d3acc68c565aeb6ada94 SHA-256: 2a8743b45bf33ea3019ebd1af254a51ecb6ad815fde00299546ad28150749abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of link farm indicators and compromised CMS upload links strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=windows+10+on+android+phone PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615152dba468c---kasewerimasokaworup.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2e8215aca---8736767375.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/71390311588.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/78982315061.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/65145794186.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/voboxi.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109091610445954.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/17966882881.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/lazomazamasavi.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/beletisaputat.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/86263701749.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/poteromofamorav.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/71653884163.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/jemivipi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63b6d2bb6bef721cf4d03e2b68380bdc/67217850385.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/tinugozumukanit.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/pawifimuzofegozoxaki.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/katisuvezome.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/75690119298.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/gotefezulopa.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nudej.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wamolakodesorikola.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/9131941350.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2f6b6859---19693984533.pdfIn PDF document text
    • http://bjjiffy.com/upload/37349724444.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/3749290476.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 10600 bytes
SHA-256: 3a46545e51e52debe475bf7ebb057a0caad52e12f4a5d3a6ecdb9bac05e9df0b
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 16048 bytes
SHA-256: 0236c209c0427d3dcd41b124dd3e1c157f42ea8fc5064cdd02477c4ba3480f40
font_02_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1