Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bbf17571da2963…

MALICIOUS

PDF

83.9 KB Created: 2021-07-27 19:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cd3e5c45c936dbbd2b0d9697abf7f5ec SHA-1: 373ec77ac4f8562cc3fa17bef3678dfe7a64bec3 SHA-256: 18bbf17571da296347d8b75511fac6ca8a125ef386be19ca5dce7c11410696d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, but the structure and URL targets are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bf7d446e9---pogenetofowubexikefil.pdf In PDF document text
    • http://mintaialuminum.com/d/files/jedipotowaguf.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/542fb951aa0d542c8c75443b54a2350f/15062268122.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c794f2b3c9---64119815781.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/95580152363.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/q4b3p813q9u3lda39lk5bfdo36/51772553919.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/ff857956dac89b86e88358870602b4f2/kajapekosokamedidi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b87c5cb7deaaa90b311421c7c09003a6/pexadiro.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef87b16e6---67319321569.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/29895667276.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/56677986165.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/wawemalapimogamo.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/11160587507.pdfIn PDF document text
    • http://derma-dts.de/files/file/68998423668.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wupobimumafara.pdfIn PDF document text
    • http://hasyo.net/files/file/mugin.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/dipamepijifotofi.pdfIn PDF document text
    • http://classofjoy.com/KK/userfiles/files/21284986470.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a17367189---zegiv.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a8f20d1ea8e7bbbb465dd3dafb274616/lexagumafed.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/weduwinatabatuvisiv.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db72e82c1cf---luvesuzijebugalikebuzog.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211707702393.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/bajivivivizigilafix.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcaee5bcac---78181504568.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/2d0fc0b0837851fa54276dd34c28147f/gidumoneletasofadubirofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+extend+a+coax+cablePDF 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_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 16724 bytes
SHA-256: e169025f79dba29cf62753754686ab7383e240e595e384552b8efb6ef5454863
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 10324 bytes
SHA-256: db6b62a701050a9d723793992e59c8cb978a31fa19f98e30288e62601eef20f4
font_02_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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