Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fea582ee103c561…

MALICIOUS

PDF

71.1 KB Created: 2021-09-23 05:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4412d0680cc4060eddae5bb147668003 SHA-1: c50617b9e609eb082904329afd47cadb9b911ee6 SHA-256: 9fea582ee103c56182ececb15b0b78e7f615a3a04efc675df6938b4faff97c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious content. Several of these links point to compromised WordPress upload directories, indicating a tactic to host malicious files on seemingly legitimate but compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=youtube+downloader+full+apk PDF link annotation
    • http://ingegnasrl.com/userfiles/files/82017535982.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161403ae3db3d2---90156271259.pdfIn PDF document text
    • https://www.nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/96762618454.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/dewoxadivogegiw.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/52539717569.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/21715719118.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/watikud.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nridbutkarjrdvi4hh50e6dm64/71119317883.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2520172d57c1c5a6566264db2b1dbece/milonafavivewuvexabez.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16145281a1f13b---12320947543.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12244789758.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/mosomefinetodemirunun.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/navamuxito.pdfIn PDF document text
    • http://gewald.ru/content/Files/mewag.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/sudeganodod.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/nosudopemovapi.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/27644913459.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/xixemofojebus.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/84906405861.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/37194051312.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/ximitisuzadaderusiwog.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/81379513479.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/buzagizusawiwela.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_off0000b6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 10632 bytes
SHA-256: aaf12df2e8f0e908d5ff0c1c4dcbe628fbeac1612ce33588d2c1d3b596282807
font_02_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 15296 bytes
SHA-256: 34a3d24360ddee087b537ccb58cf6eb31582cba1a838361cad99d8820018c1f4