Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf14d822486f5277…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 13:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0366620169fb0718901784ffc6cce510 SHA-1: ea91306215ec42f0ee7e82286aceb472d7610ad8 SHA-256: bf14d822486f5277a8f99ff9f7a8d8f1822e5af012289d23070e6625c0edab30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the links indicate an attempt to lure users to malicious sites, likely for phishing or malware distribution.

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://wisserarm.nl/app/webroot/files/userfiles/files/10319860105.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/pcs6i43icbbklgk33o6dpr61f4/45425774953.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/4966680702.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094763ec9490---42756837860.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f52c4faa---deguvipekapisisugamo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054031b90b---29033362351.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/tivuwovezegofanavak.pdfIn PDF document text
    • http://sns.hu/_user/file/vonuwuzudi.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/517bacc04398de28c3a1f33c798f8651/27364644877.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tuvovoriralexo.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/44de4b0b397291bcd514eb0a36bddc7f/24395774241.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/17427101002.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/25619018460.pdfIn PDF document text
    • https://biocoils.com/img/file/51744981435.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c6936786---13629393740.pdfIn PDF document text
    • http://meskerjager.nl/media/files/sibapiva.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/tekomijobazagajisewezidi.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/godemukegakesukifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+does+round+robin+bet+meanPDF 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_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10700 bytes
SHA-256: 26868c09a7d5583c765c5b8e0ca72dca38291d04c86bc0b81c9c1e282c7ff261
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 17204 bytes
SHA-256: e3270359f7ed060c9b35441df41bca4cf4953db60321428dd3957a018e123d77