Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d87b5bcf07bd9af…

MALICIOUS

PDF

86.1 KB Created: 2021-08-09 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6037d4212428af9f0f646caa36f123f6 SHA-1: b4b1ddff2cc1ca48606978724edfb800748fec31 SHA-256: 7d87b5bcf07bd9afee8dbcbb7d9b1938e8a4cb85d0eb5d80414205ba619ce0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to other sites. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b37c9c058e503edd442f3cbdf12798aa/xorusimewojatojo.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e10f77488---rorajodi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0c8a991549f47a2fbf8ab6c1cba5fc9d/25448670934.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/57459168442.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ccb9ab642---sujoledogipibalivakugow.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4608b274---naxuwagaj.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6ed058201---bevusanub.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/sabof.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e75edd0e7862ac09e154d34992a877c/43180441001.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/eoqmht01a33nbs4dmm00shrgvr/nekalunejug.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd8339c35---7513567466.pdfIn PDF document text
    • http://landia-print.com/pdir/file/sunexemobalevoxemiduwexer.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/119cdc3021ef0567b5d426265de2ac8b/tiropivulakutumawowizagi.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pijagogebikajewizu.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/51142123280.pdfIn PDF document text
    • https://petikdaun.com/contents//files/nozerodavuvapateso.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rnvg8dj0onob656ncdckucu61t/19562528318.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/liguleditudulajemagixefe.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/91250341493.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c1772a6f---56739808076.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/ripazikoguxunezuta.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bipobulinepipupijoleg.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/zojepas.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/rikipulote.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16102539808cc8---pivikizarenoxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=indistractable+launcher+pro+apk+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 11064 bytes
SHA-256: b75535aaff53f3a75b9b52225e0147eb40d1ea2d689f18750aacd94a3fc58f5e
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 17324 bytes
SHA-256: ed68f1d6b8d2713fd02f4b6c5d79afaa8cf67fbb6dc16e0686e64ab2477982b5
font_03_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 16188 bytes
SHA-256: 05ba96187fcbeecb99048e2a12fca29be5fc7fdb123f278ec0a2efa66ad64037