Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6886d4de303792d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-22 11:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 604778b2f777f49c65ea550d91ece7d0 SHA-1: 5262cf50397830d6aa658869de4354bc4d67ad86 SHA-256: f6886d4de303792dfcc3e6c417fc7dd13adcfefdfae16e50298534c6c5e50630
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic specifically points to the document instructing users to open a password-protected archive, a technique often used to conceal malware from initial security scans. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=apk+editor+clone+app PDF link annotation
    • https://eastoncn.housemember.com/uploads/files/66022761179.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7d9e9a08f77fe03619ab0d2d0d5d1309/76629999495.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/pomevatekizojevoragaxon.pdfIn PDF document text
    • http://screen.by/images/file/winajapitarewakigajubonat.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/4984286244.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/71383469959.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f00e2016ae---75002557308.pdfIn PDF document text
    • https://medtek.vn/storage/file/jeloxozadepazeri.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/72394829129.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/43964204957.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/75e2128a47170ad1531fec409ab2e9e6/19935453003.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/zasomevat.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/nexedix.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/42216196271.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/nijamor.pdfIn PDF document text
    • http://recrute.fr/files/files/52043465461.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d0300dbbc2ae79cc461fd98b27a422f2/16843969024.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/zusolezipigenonup.pdfIn PDF document text
    • http://tapuionoticias.com/ckfinder/files/debudofebizifujesobodoref.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/52945508621.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/44222456066.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/48437109223.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///94205345694.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/4316913213.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/88600179040.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/pafifosudujukakixodajuje.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_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 17108 bytes
SHA-256: 651e93cb635c8b958f07ab0c184b04598ee231d570678daba2568e3e0278a113
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 10412 bytes
SHA-256: 40b1f5e71ef9bd842c84bc7a0252c9878a099bda3984771b8dc50a80acf236e0

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