Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d3a6d7ddeec9fe…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 078dab207c99d019555c356425046e58 SHA-1: 18a88dcdc538fd7924f2f69490a57ae821004d40 SHA-256: d9d3a6d7ddeec9fe66dff3753fdcbd11d541151905263b15cbe2676e11414706
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a raw IP address and others hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. No scripts were extracted, but the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=classical+music+without+words PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140260d9eae5---6398036148.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/13425314160.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109061400224166.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/derogaw.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/71007130369.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/35566144272.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/42471838165.pdfIn PDF document text
    • http://dmkert.hu/files/file/turinogerisonajezesixuku.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/68243413337.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/19de46b3066ee21265f547ffaca48477/kalofojomexutevux.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/59129465125.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143441453523---remakujigik.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/didiki.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7bab85d62df74a13e7f5607a46aa33e7/25881943218.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fewurepoge.pdfIn PDF document text
    • http://blccy.com/userfiles/files/rerigivol.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/19598290586.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/xakatizawulerinuka.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210908115225.pdfIn PDF document text
    • https://amgaa.org/temp/files/suvowusuxozokezazobaxijuf.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/dokorokukubo.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/guvepanivazabovavut.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/50173958547.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/wofurevavomefevero.pdfPDF 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_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 10616 bytes
SHA-256: 9eb414e4d6c571cd1cd2cddaec714de3943d05b068569d5bbcc011ad53747784
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 17996 bytes
SHA-256: cd1639e879968db3a0f15247a98875e4918851d14aa161a97dd19d8130b36975

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