Malicious PDF — malware analysis report

Static analysis result for SHA-256 f601a20f61676e05…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 04:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e65f857a4af477ffc92d412f568dd77b SHA-1: 68e32831ee5ee86c7429f970bc4f3e01c147bda1 SHA-256: f601a20f61676e05659145bd1704d43cf875c6827255a55bb7335641e9233e55
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bnbcostaverde.it/userfiles/file/29796933731.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/94993892679.pdfIn PDF document text
    • https://amblamy.ee/upload/file/bumibak.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e5f306511---72997062232.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abb5ccf538---sugojotemolobuxagutok.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/kulubojijadusizenol.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/tomibu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e23eab961---fuzupizuzi.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/98479735273.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8180de471ef3018b276fd42f069918fb/37665235251.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d253096bfe---dafade.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f80981379---wurijipijipo.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/joxumekalazovo.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/zibetapagozedober.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/28796520f715fea50443bc31591c8c36/zuluzom.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf14362f67---sasurigexajapebub.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/70293242015.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91694ecb9a---17785927638.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/xukenewawaxino.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/xetepatebekefinaxog.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a2f5ci32fb4e8rs6mc9dq2bm3a/71982500064.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/21264759710.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/bajoketumukeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+sq11+full+hd+1080p+mini+dvPDF link annotation
    • 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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 17720 bytes
SHA-256: e768ae746f11964cbaa67bf0e677bca7c89dabfe46360fdedeaa8a78d08a1567
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 11272 bytes
SHA-256: 5178bbc5df1d9dc8769621d5a4a5c7455274fbb64043a11cabd06693caeb3bdc
font_02_sfnt_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.