Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec01bf3499528421…

MALICIOUS

PDF

68.5 KB Created: 2021-09-12 09:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b953e8e40cfab795c2cdc6d6fe47c19 SHA-1: 7148f2bfbdaa23494fd26ee064faf6e2b22436d3 SHA-256: ec01bf3499528421c94aed66a64af72be7f5f648bb97e31a95902b0b707ec4f5
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=textsecure+private+messenger PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/62218973598.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/vasipu.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/35948658062.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/sekemikafinumoxunopi.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/96111409712.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339d2edbda2---piramozider.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/zixaxewoduruditakofiwuto.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/93369978006.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/kadawij.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/lonene.pdfIn PDF document text
    • http://aven.su/userfiles/file/fugetinowibubil.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/55884418411.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/zekirixobifitojarajabera.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/90403311680.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/7710787213.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136091e12807---rolumeluxadoxofalosin.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/lawenematoji.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/zosazulizopivisu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985fbe2e4---66918378757.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/kafugexokudebalobe.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/werinagabovisutiza.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/20424812647.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee10646406---49053169545.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16132737757135---73745297001.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 14196 bytes
SHA-256: 1bfa6d329542a8a9a1ed16a0922d9d72968937c60a12cd431677d4532e702639
font_01_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 10780 bytes
SHA-256: 1a28381d05b59d3caaad4751809fdf96b313a9df71cbf2b096181148caf3beea
font_02_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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