Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb50a41774bd237…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 20:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be27364a574a5057dae7a08196a3a01d SHA-1: 8c4da18e30b2ae3d4f3a151512eb08234d7c28f2 SHA-256: 2cb50a41774bd2370e548b972680af1618a0cf3b6def325ba2908f70a5122a93
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms on compromised CMS uploads indicates a multi-stage attack. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=android+meaning+in+bengali PDF link annotation
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zexikalibejila.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdd5adc25---93533246466.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vupigegixim.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/51731610580.pdfIn PDF document text
    • http://blgjad.com/upload/files/xuvafujuzewibozo.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/damipijovefi.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tazosawesaki.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/xegapujovupomixi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/duwafisefajavuma.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/fimup.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/25077938641.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/wotobagonukenadapusozuzej.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/85233070541.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tezapetetawog.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/36779791151.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/97457429764.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624d5d3e9b---vuzizitutunamo.pdfIn PDF document text
    • http://duvarkagidierzincan.com/userfiles/file/sajanokojamerutebumamilu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4b63580fc6f426db4a412c3e35ff249d/ninuna.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/zesukozexigafis.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/74354420306.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/wafebezitibere.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161344d6f3523c---tixak.pdfIn PDF document text
    • https://airxps.com/userfiles/files/dilozutonevemefuzane.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/xopifefuworiw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 10448 bytes
SHA-256: caa3c16879263bdcd2c0504933d702dc3068dca6998521f4185923ac467cf608
font_01_sfnt_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 20672 bytes
SHA-256: bab8d466596d74a997915a707e496741a80890093b69792600b94f008d5bded2
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000123f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F3 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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