Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2f1580994c4986…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 21:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ffde8686be7a12afa5aa6cc410c4d74 SHA-1: 7b10e658f8c42fd229cdae6edaf7802c36ce7024 SHA-256: fa2f1580994c498649120cf34f29f9855f9106fe0dd7e29ce59e12e0ddc9e9a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm designed to leverage SEO and compromised hosting, with numerous URLs pointing to external resources. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the malicious intent of using these links for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://hflbdq.com/uploads/file/031623249730.pdf In PDF document text
    • http://erfansari.ir/ckeditor/files/files/kuzin.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/noriwa.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99654419715.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/nazusulafupofap.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/7724cef9811ca6411a0ad1e96ae12ddc/80238983296.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/tojuderubexudelugedi.pdfIn PDF document text
    • http://thepducphat.com/upload/files/wadema.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/768529c95434b363f6350bbd8f16ae87/97813396731.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/47277290833.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/19116173321.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/57801167834.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/20837439074.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ja2v9tohk8mog27fusldeh9063/newexulevigimol.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xudopuninetejiguzotowine.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tojoxoxedibolo.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/38344248320.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a613196dd---xakekene.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136463129330---lamoduwefisirazuv.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210908232443.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/tajasitevomom.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0948053001630826316.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xinebulubosuzamimel.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/99454968487.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/52679332716.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/riwexuvaj.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f09e1062b---66390616785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=toilet+full+movie+watch+online+filmywapPDF 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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 17892 bytes
SHA-256: fa704989e2ca4084f069bddcad950f7eaeaea2700c05b59655b5a123ea3bf1ca
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 10804 bytes
SHA-256: e896f177d4612eb7ffd1d561d3fe1de22ab90093381437d6d81b6ee9954b733d