Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb05b98621d8e6e2…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 14:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a0ca1b2da12cf388223551956f20c003 SHA-1: 137191f1066003113ce472df70297ad57e80b69b SHA-256: bb05b98621d8e6e2967ae3f8788a4f5acd4bb49b42e40689e1d68027d9eea348
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or exploits, suggesting an initial access vector via spearphishing attachment and exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2479c3e612a0dd4b6c1136cbe2353875/duzazu.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/liduberoveluz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a9890a3409dd70baa1a50c0d5935ed34/19112196945.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2e63c882---78736529305.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/g7aivlqttg3ogcldjcg6b1g2c7/95230485597.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5bc4b7a2061c225142227fa36760dbd7/76812911907.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/47875413922.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3366bbe3b7---jirexizamijamu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a490492e2---73815870320.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0095a225b---nafegibokiduzujuras.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a88d497374f---sepawixanotaba.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7d978b1a---bigatetuwujowere.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0bbfc77ab04b1810529c00ebd3132412/xupew.pdfIn PDF document text
    • http://c-amc.com/upload/files/76155409643.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e1b9b353b272860c7ca32a119a6087f3/62338190152.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f7a6f3dd---wutonukegaxakoxavigudiwo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7a73838e1ee8ad5d351c91bc77463330/kurofaruduvakowalarokavo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3fc269a150a130ecb85bfa8f95571308/5468205395.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6413324c0---58467575568.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621804045.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wiwowupovejiwavutale.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a677c8c6dbfe22392f39ea3da57cda6e/dupulu.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/51685103355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+mona+lisa+is+the+artwork+ofPDF 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10620 bytes
SHA-256: 92096915d80ccfc9ad975669e33023e6a59673c3ef0164672a2ec33a60db18b1
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 17016 bytes
SHA-256: abe7eb760169aa0f130a90792e2d5b452c3b8f658f7ab546738ef3582c1366bd
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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